Iowa: 2002 - Census.gov · Forestry, and Fishing sector under the SIC system: landscape agricultural services, landscaping services, veterinary services, and pet care services. Printed

Iowa: 2002

2002 Economic Census

Transportation

2002 Commodity Flow Survey

Issued December 2004

EC02TCF-IA

U.S. Department of TransportationBUREAU OF TRANSPORTATION STATISTICS

U.S. Department of CommerceEconomics and Statistics Administration

U.S. CENSUS BUREAU

This report was prepared in the Service Sector Statistics Division under the direction of Thomas E.Zabelsky, Assistant Division Chief for Current Service and Transportation Programs. Planning,implementation, and compiling of this report were under the supervision of John L. Fowler, Chief,Commodity Flow Survey Branch, assisted by Bruce Dembroski, Marilyn Quiles Amaya, DebraCorbett, Shirley Gray, Stephanie Groth, Michael Jones, Mabel Ocasio, Bonnie Opalko, JoycePrice, and Barbara Selinske.

Sample design and statistical methodology were developed under the direction of Ruth E. Detlefsen,Assistant Division Chief, Research and Methodology. Sample design and estimation were developedunder the supervision of Jock Black, Chief, Program Research and Development Branch, assisted byWilliam C. Davie Jr., Jacklyn R. Jonas, Brett Moore, M. Cristina Cruz, and Michael Beaghen.Frame construction, status change, editing, and imputation procedures were developed under thesupervision of Carol King, Chief, Statistical Methods Branch, assisted by David Kinyon, AnthonyMyers, and Quatracia Williams.

The processing system and computer programs were developed and implemented by the EconomicStatistical Methods and Programming Division, under the direction of Barry F. Sessamen, AssistantDivision Chief for Post Collection, assisted by Steven G. McCraith, Chief, Census Related SurveysBranch, Joy McLaughlin, John Nelson, Duc-Mong Nguyen, and Edna Vega.

The Systems Support Division provided the table composition system. Robert Joseph Brown, TableImage Processing System (TIPS) Senior Software Engineer, was responsible for the design anddevelopment of the TIPS, under the supervision of Robert J. Bateman, Assistant Division Chief,Information Systems.

Coordination of data collection efforts was under the direction of National Processing Center, Judith N.Petty, Chief, assisted by Carlene Bottorff, Linda Broadus, Sandra Hurst, Debbie Woods, DebbieHamilton, and Michael Lutz.

Margaret A. Smith and Michael T. Browne of the Administrative and Customer Services Division,Walter C. Odom, Chief, provided publications and printing management, graphics design andcomposition, and editorial review for print and electronic media. General direction and productionmanagement were provided by James R. Clark, Assistant Division Chief, and Susan L. Rappa, Chief,Publications Services Branch.

The Bureau of Transportation Statistics (BTS) of the Department of Transportation played a major role inall aspects of the Commodity Flow Survey. Jack Wells, Chief Economist, assisted with programplanning and oversight. Survey methodology, design, and implementation were conducted under thedirection of Michael P. Cohen, Assistant Director for Survey Programs assisted by BTS staff: MikeMargreta, Ronald J. Duych, Joy Sharp, Julie Smith, Irwin Silberman, Promod Chandhok,Hossain Sanjani, and Scott Dennis. Felix Ammah-Tagoe and Adhi Dipo of MacroSys Research andTechnology assisted BTS in various aspects of the survey. Frank Southworth, Shih-Miao Chin, andBruce Peterson of Oak Ridge National Laboratory, provided support to BTS staff in performing themileage calculations for the survey.

Special acknowledgment is also due to the many businesses whose cooperation has contributed to thepublication of these data.

ACKNOWLEDGMENTS

Iowa: 2002

2002 Economic Census

Transportation


Issued December 2004

EC02TCF-IA

U.S. Department ofTransportation

Norman Y. Mineta,Secretary

Kirk K. Van Tine,Deputy Secretary

BUREAU OF TRANSPORTATIONSTATISTICS

Rick Kowalewski,Deputy Director

U.S. Department of CommerceDonald L. Evans,

SecretaryTheodore W. Kassinger,

Deputy Secretary

Economics and Statistics AdministrationKathleen B. Cooper,

Under Secretary forEconomic Affairs

U.S. CENSUS BUREAUCharles Louis Kincannon,

Director

Vacant,Principal AssociateDirector for Programs

Frederick T. Knickerbocker,Associate Directorfor Economic Programs

Thomas L. Mesenbourg,Assistant Directorfor Economic Programs

Mark E. Wallace,Chief, Service SectorStatistics Division

BUREAU OF TRANSPORTATIONSTATISTICS

Rick Kowalewski,Deputy DirectorMary J. Hutzler,Associate Directorfor Statistical Programs

William J. Chang,Associate Director forInformation Systems

ECONOMICS

AND STATISTICS

ADMINISTRATION

Economicsand StatisticsAdministration

Kathleen B. Cooper,Under Secretaryfor Economic Affairs

U.S. CENSUS BUREAU

Charles Louis Kincannon,Director

Hermann Habermann,Deputy Director andChief Operating Officer

CONTENTS

Introduction to the Economic Census v��

2002 Commodity Flow Survey ix��

Tables

1a. Shipment Characteristics by Mode of Transportation for State ofOrigin: 2002 1��

1b. Shipment Characteristics by Mode of Transportation for State ofOrigin: Percent of Total for 2002 and 1997 1��

2. Shipment Characteristics by Total Modal Activity for State ofOrigin: 2002 2��

3. Shipment Characteristics by Mode of Transportation andDistance Shipped for State of Origin: 2002 3��

4. Shipment Characteristics by Mode of Transportation andShipment Weight for State of Origin: 2002 6��

5a. Shipment Characteristics by Two�Digit Commodity for State ofOrigin: 2002 9��

5b. Shipment Characteristics by Two�Digit Commodity for State ofOrigin: Percent of Total for 2002 and 1997 10��

6. Shipment Characteristics by Two�Digit Commodity and Mode ofTransportation for State of Origin: 2002 11��

7. Outbound Shipment Characteristics by State of Destination forState of Origin: 2002 26��

8. Inbound Shipment Characteristics by State of Origin for State ofDestination: 2002 27��

9. Shipment Characteristics by Mode of Transportation for State ofOrigin: 2002 and 1997 30��

10. Shipment Characteristics by Commodity Group for State ofOrigin: 2002 and 1997 30��

Appendixes

A. Comparability With the 1997 Commodity Flow Survey A–1��

B. Reliability of the Estimates B–1��

C. Sample Design, Data Collection, and Estimation C–1��

D. Standard Classification of Transported Goods CodeInformation D–1��

Transportation�Commodity Flow Survey Iowa iiiBureau of Transportation Statistics and U.S. Census Bureau, 2002 Economic Census

Introduction to the Economic Census

PURPOSES AND USES OF THE ECONOMIC CENSUS

The economic census is the major source of facts about the structure and functioning of theNation’s economy. It provides essential information for government, business, industry, and thegeneral public. Title 13 of the United States Code (Sections 131, 191, and 224) directs the CensusBureau to take the economic census every 5 years, covering years ending in “2” and “7”.

The economic census furnishes an important part of the framework for such composite measuresas the gross domestic product estimates, input/output measures, production and price indexes,and other statistical series that measure short-term changes in economic conditions. Specific usesof economic census data include the following:

• Policymaking agencies of the federal government use the data to monitor economic activity andto assess the effectiveness of policies.

• State and local governments use the data to assess business activities and tax bases withintheir jurisdictions and to develop programs to attract business.

• Trade associations study trends in their own and competing industries, which allows them tokeep their members informed of market changes.

• Individual businesses use the data to locate potential markets and to analyze their own produc-tion and sales performance relative to industry or area averages.

BASIS OF REPORTING

The economic census is conducted on an establishment basis. A company operating at more thanone location is required to file a separate report for each store, factory, shop, or other location.Each establishment is assigned a separate industry classification based on its primary activity andnot that of its parent company.

AVAILABILITY OF ADDITIONAL DATA

All results of the 2002 Economic Census are available on the Census Bureau Internet site(www.census.gov) and on compact discs and digital versatile discs (CD-ROMs and DVD-ROMs) forsale by the Census Bureau. The American FactFinder system at the Web site allows selectiveretrieval and downloading of the data. For more information, including a description of reportsbeing issued, see the Web site, write to the U.S. Census Bureau, Washington, DC 20233-8300, orcall Customer Services at 301-763-4636.

HISTORICAL INFORMATION

The economic census has been taken as an integrated program at 5-year intervals since 1967 andbefore that for 1954, 1958, and 1963. Prior to that time, individual components of the economiccensus were taken separately at varying intervals.

The economic census traces its beginnings to the 1810 Decennial Census, when questions onmanufacturing were included with those for population. Coverage of economic activities wasexpanded for the 1840 Decennial Census and subsequent censuses to include mining and somecommercial activities. The 1905 Manufactures Census was the first time a census was taken apartfrom the regular decennial population census. Censuses covering retail and wholesale trade andconstruction industries were added in 1930, as were some service trades in 1933.

Introduction v2002 Commodity Flow Survey

Bureau of Transportation Statistics and U.S. Census Bureau, 2002 Economic Census

Censuses of construction, manufacturing, and the other business service censuses were sus-pended during World War II.

The 1954 Economic Census was the first census to be fully integrated, providing comparable cen-sus data across economic sectors and using consistent time periods, concepts, definitions, classi-fications, and reporting units. It was the first census to be taken by mail, using lists of firms pro-vided by the administrative records of other Federal agencies. Since 1963, administrative recordsalso have been used to provide basic statistics for very small firms, reducing or eliminating theneed to send them census report forms.

The range of industries covered in the economic censuses expanded between 1967 and 2002.The census of construction industries began on a regular basis in 1967, and the scope of serviceindustries, introduced in 1933, was broadened in 1967, 1977, and 1987. While a few transporta-tion industries were covered as early as 1963, it was not until 1992 that the census broadened toinclude all of transportation, communications, and utilities. Also new for 1992 was coverage offinancial, insurance, and real estate industries. With these additions, the economic census and theseparate census of governments and census of agriculture collectively covered roughly 98 percentof all economic activity. New for 2002 is coverage of four industries classified in the Agriculture,Forestry, and Fishing sector under the SIC system: landscape agricultural services, landscapingservices, veterinary services, and pet care services.

Printed statistical reports from the 1997 and earlier censuses provide historical figures for thestudy of long-term time series and are available in some large libraries. CD-ROMs issued from the1987, 1992, and 1997 Economic Censuses contain databases including all or nearly all data pub-lished in print, plus additional statistics, such as ZIP Code statistics, published only on CD-ROM.

SOURCES FOR MORE INFORMATION

More information about the scope, coverage, classification system, data items, and publicationsfor each of the economic censuses and related surveys is published in the Guide to the 2002 Eco-nomic Census at www.census.gov/epcd/ec02/guide.html. More information on the methodology,procedures, and history of the censuses will be published in the History of the 2002 EconomicCensus at www.census.gov/econ/www/history.html.

vi Introduction 2002 Commodity Flow Survey



GENERAL

The 2002 Commodity Flow Survey (CFS) is undertaken through a partnership between the U.S.Census Bureau, U.S. Department of Commerce, and the Bureau of Transportation Statistics (BTS),U.S. Department of Transportation. This survey produces data on the movement of goods in theUnited States. It provides information on commodities shipped, their value, weight, and mode oftransportation, as well as the origin and destination of shipments of manufacturing, mining,wholesale, and select retail establishments. The data from the CFS are used by public policy ana-lysts and for transportation planning and decision making to assess the demand for transporta-tion facilities and services, energy use, and safety risk and environmental concerns. The CFS waslast conducted in 1997.

This report contains background information on the 2002 Commodity Flow Survey and then pre-sents detailed tabular results on shipment characteristics by mode of transportation, commodity,distance shipped, and shipment weight. In Appendix A, key characteristics of the 2002 CFS arecompared to those of the 1993 and 1997 surveys. Appendix B focuses on the reliability of theestimates and discusses sampling and nonsampling errors. Tables containing estimates of sam-pling variability corresponding to each table on shipment characteristics are also included inAppendix B.

This report presents data at the state level. Additional reports will include data for the UnitedStates, census regions, divisions, and selected metropolitan areas, as well as selected data onexports and hazardous material shipments.

INDUSTRY COVERAGE

The 2002 CFS covers business establishments with paid employees that are located in the UnitedStates and are classified using the 1997 North American Industry Classification System (NAICS) inmining, manufacturing, wholesale trade, and select retail trade industries, namely, electronicshopping and mail-order houses. Establishments classified in services, transportation, construc-tion, and most retail industries are excluded from the survey. Farms, fisheries, foreign establish-ments, and most government-owned establishments are also excluded.

The survey also covers auxiliary establishments (i.e., warehouses and managing offices) of multi-establishment companies, which have nonauxiliary establishments that are in-scope to the CFS orare classified in retail trade. The coverage of managing offices has been expanded in the 2002CFS, compared to the 1997 CFS. For the 1997 CFS, the number of in-scope managing offices wasreduced to a large extent based on the results of the 1992 Economic Census. A managing officewas considered in-scope to the 1997 CFS only if it had sales or end-of-year inventories in the1992 Census. However, research conducted prior to the 2002 CFS showed that not all managingoffices with shipping activity in the 1997 CFS indicated sales or inventories in the 1997 EconomicCensus. Therefore, the 1997 Economic Census results were not used in the determination ofscope for managing offices in the 2002 CFS.

For the 1993 CFS and the 1997 CFS, establishments were classified based on the 1987 StandardIndustrial Classification System (SIC). Though an attempt was made to maintain similar coveragebetween the 1997 CFS and the 2002 CFS, there were some changes in industry coverage due tothe conversion from SIC to NAICS. Most notably, coverage of the logging industry changed froman in-scope Manufacturing SIC code (SIC 2411) to an out-of-scope Agriculture, Forestry, Fishing,and Hunting NAICS code (NAICS 1133). Also, coverage of the publishing industry changed fromin-scope Manufacturing SIC codes (SIC 2711, 2721, 2731, 2741, and part of 2771) to out-of-scopeInformation NAICS codes (NAICS 5111 and 51223).

2002 Commodity Flow Survey viiTransportation—Commodity Flow Survey


See Appendix A for a comparison between the 2002, 1997, and 1993 surveys. Also seeAppendix C for a more detailed discussion on industry coverage and the sample design.

The NAICS industries covered in the 2002 CFS are listed in the following table:

NAICScode Description

212 Mining (Except Oil and Gas)

311 Food Manufacturing312 Beverage and Tobacco Product Manufacturing313 Textile Mills314 Textile Product Mills315 Apparel Manufacturing316 Leather and Allied Product Manufacturing

321 Wood Product Manufacturing322 Paper Manufacturing323 Printing and Related Support Activities324 Petroleum and Coal Products Manufacturing325 Chemical Manufacturing326 Plastics and Rubber Products Manufacturing327 Nonmetallic Mineral Product Manufacturing

331 Primary Metal Manufacturing332 Fabricated Metal Product Manufacturing333 Machinery Manufacturing334 Computer and Electronic Product Manufacturing335 Electrical Equipment, Appliance, and Component Manufacturing336 Transportation Equipment Manufacturing337 Furniture and Related Product Manufacturing339 Miscellaneous Manufacturing

421 Wholesale Trade, Durable Goods422 Wholesale Trade, Nondurable Goods

4541 Electronic Shopping and Mail-Order Houses

49310 Warehousing and Storage

551114 Corporate, Subsidiary, and Regional Managing Offices

SHIPMENT COVERAGE

The CFS captures data on shipments originating from select types of business establishmentslocated in the 50 states and the District of Columbia. The data do not cover shipments originatingfrom business establishments located in Puerto Rico and other U.S. possessions and territories.Shipments traversing the U.S. from a foreign location to another foreign location (e.g., fromCanada to Mexico) are not included, nor are shipments from a foreign location to a U.S. location.Imported products are included in the CFS at the point that they left the importer’s domestic loca-tion for shipment to another location. Shipments that are shipped through a foreign territory withboth the origin and destination in the U.S. are included in the CFS data. The mileages calculatedfor these shipments exclude the international segments (e.g., shipments from New York to Michi-gan through Canada do not include any mileages for Canada). Export shipments are included,with the domestic destination defined as the U.S. port, airport, or border crossing of exitfrom the U.S.

The ‘‘Industry Coverage’’ section of the text lists the NAICS groups covered by the CFS. Otherindustry areas that are not covered, but may have significant shipping activity, include agricultureand government. For agriculture, specifically, this means that the CFS does not cover shipments ofagricultural products from the farm site to the processing centers or terminal elevators (mostlikely short-distance local movements), but does cover the shipments of these products from theinitial processing centers or terminal elevators onward.

MILEAGE CALCULATIONS

To estimate the distance traveled by each freight shipment sampled for the 2002 Commodity FlowSurvey, the BTS Mileage Calculation Team used routing algorithms and an integrated, intermodaltransportation network developed and updated expressly for this purpose by the Oak Ridge

viii 2002 Commodity Flow Survey Transportation—Commodity Flow Survey


National Laboratory (ORNL). The BTS Team worked at a secure data site within the Census Bureau.Each record contained the ZIP Code shipment origin and destination, and the mode or modalsequence required by the routing algorithm for distance estimation. Each record also containedinformation on type of commodity moved, its weight, dollar value, and hazardous materials sta-tus. For export shipments, data on the U.S. port of exit were also identified, along with foreigndestination city and country. Processing of shipment records began in the fall of 2002, withcompletion in October 2003.

One essential exercise was editing and imputing both absent and invalid geographic data ele-ments, specifically origin and destination ZIP Codes, prior to estimating the distance traveled foreach freight shipment. For this purpose, the BTS Mileage Calculation Team developed and main-tained databases of domestic city/state names and foreign city/country names. The missing dataelements, along with other related data problems found by the BTS Team, were either: (1) imputedbecause of high probability of accurate correction by the BTS Team, such as imputing a missingdestination ZIP Code, given a destination city and state; or (2) reported back to the CensusBureau, allowing for call-backs to shippers for clarification/correction.

For a domestic shipment, the mileage is calculated between the center of the geographic area(centroid) of the U.S. origin ZIP Code and the centroid of the destination ZIP Code. The mileage forthe shipments within a ZIP Code is calculated by means of a formula that approximates the long-est distance within the boundaries of that ZIP Code. The mileage for an export shipment is calcu-lated between a shipments centroid of U.S. origin ZIP Code and its foreign destination country(city in the case of Canada and Mexico), via a U.S. port of exit (POE), be it seaport, airport, or bor-der crossing. However, only the portion of mileage that falls within the U.S. is included in the CFSestimates. That is to say, once the export reaches the POE, the POE is considered the final domes-tic destination, the domestic route is finished, and any following mileage is not counted from thePOE. These mileages are computed using routing algorithms that find the minimum impedancepath over mathematical representations of the U.S. and North American highway, railway andwaterway networks, and a transglobal representation of U.S.originating air freight and deep-seatransport networks. Shipment mileages were estimated for each record by summing over the dis-tances of links contained within each minimum impedance path. Impedance was computed as aweighted combination of distance, time, and cost factors.

The ORNL multimodal network database is composed of mode-specific subnetworks representingeach of the major transportation modes, such as highway, railway, waterway, and airway (pipelinenetwork was not available due to security reasons). The links of these networks represent line-haul transportation facilities. Network nodes represent intersections and interchanges, along withthe access points to the transportation network. To simulate local access, test links are createdfrom each five-digit ZIP Code centroid to nearby nodes on the network. For the truck network,local access is assumed to exist everywhere. For the other modes this is not true. Before any testlinks are created for these modes, a search procedure is used to determine if and where such net-works are most likely to provide access to the ZIP Code. For shipments involving more than onemode, such as truck-rail or rail-water shipments, intermodal transfer links are added to the net-work database to connect the individual modal networks together for routing purposes. An inter-modal terminals database and a number of terminal transfer models were developed at ORNL toidentify likely transfer points for different classes of freight. A measure of link impedance was cal-culated for each access, line-haul, and intermodal transfer link traversed by a shipment. Theseimpedances were mode specific and are based on various link characteristics. For example, theset of links characterizing the highway network included speed impacting factors, such as thepresence of a divided or undivided roadway, the degree of access control, the rural or urban set-ting, the number of lanes, the degree of urban congestion, and the length of the link. Link imped-ance measures were also assigned to the local access links. Intermodal transfer link impedancesare estimated in terms of the time it takes to move goods through a transfer facility. In the case ofrail and air freight, intercarrier transfer penalties were also considered to obtain proper routeselections. A shortest path algorithm is used to find the minimum impedance path between ashipment’s origin ZIP Code centroid and destination ZIP Code centroid. The cumulative length of

2002 Commodity Flow Survey ixTransportation—Commodity Flow Survey


the local access plus line-haul links on this path provides the estimated distances used in CFSmileage computations. When rail and air freight were involved, these shipment distances wereoften averaged over more than one path between an origin-destination pair.

Mileage Data for Pipeline Shipments

For pipeline shipments, ton-miles and average miles per shipment are not shown in the tables. Formost of these shipments, the respondents reported the shipment destination as a pipeline facilityon the main pipeline network. Therefore, for the majority of these shipments, the resulting mile-age represented only the access distance through feeder pipelines to the main pipeline network,and not the actual distance through the main pipeline network. Pipeline shipments are included inthe U.S. totals for ton-miles and average miles per shipment.

For security purposes, there is no pipeline network available in the public domain with which toroute petroleum-based products. Hence, any modal distance, either single or multi, involving pipe-line was considered as solely pipeline mileage from origin ZIP to destination ZIP and calculated toequal great circle distance (GCD). Note: Great circle distance is defined as the shortest distancebetween two points on the earth’s surface, taking into account the earth’s curvature.

EXPLANATION OF TERMS

Value of shipments. The dollar value of the entire shipment. This was defined as the net sellingvalue, f.o.b. plant, exclusive of freight charges and excise taxes. The value data are displayed inmillions of dollars.

The total value of shipments, as measured by the CFS, and the U.S. gross domestic product (GDP)while similar in size provide different measures of economic activity in the United States and arenot directly comparable. GDP is the value of all goods produced and services performed by laborand capital located in the United States. In 2002, the U.S. GDP was estimated at $10.4 trillion(measured in current U.S. dollars). The value of shipments, as measured by the CFS, is the marketvalue of goods shipped from manufacturing, mining, wholesale, and mail order retail establish-ments, as well as warehouses and managing offices of multiunit establishments.

Three important differences can be identified between GDP and value of shipments:

1. GDP captures goods produced by all establishments located in the United States, while theCFS measures goods shipped from a subset of all goods-producing establishments.

2. GDP measures the value of goods produced and of services performed. CFS measures thevalue of goods shipped.

3. GDP counts only the value-added at each step in the production of a product. CFS captures thevalue of shipments of materials used to produce or manufacture a product, as well as thevalue of shipments of the finished product itself. This means that the value of the materialsused to produce a particular product contributes multiple times to the value.

Commodity. Products that an establishment produces, sells, or distributes. This does not includeitems that are considered as excess or byproducts of the establishment’s operation. Respondentsreported the description and the five-digit Standard Classification of Transported Goods (SCTG)code for the major commodity contained in the shipment, defined as the commodity with thegreatest weight in the total shipment.

Average miles per shipment. For the 1993 CFS, we excluded shipments of Standard Transpor-tation Commodity Classification (STCC) 27, Printed Matter, from our calculation of average milesper shipment. We made this decision after determining that respondents in the 1993 CFS shippingnewspapers, magazines, catalogs, etc., had used widely varying definitions of the term ‘‘ship-ment.’’

For the 1997 and 2002 CFS, we made numerous efforts throughout our data collection and editingto produce consistent results from establishments shipping SCTG 29, Printed Products. As aresult, we have included printed products in the average miles per shipment estimates for 1997and 2002.

x 2002 Commodity Flow Survey Transportation—Commodity Flow Survey


Distance shipped. In Table 3, shipment data are presented for various ‘‘distance shipped’’ inter-vals. Shipments were categorized into these ‘‘distance shipped’’ intervals based on the great circledistance between their origin and destination ZIP Code centroids. All other distance-related data inthis and other tables (i.e., ton-miles and average miles per shipment) are based on the mileagecalculations. (See the ‘‘Mileage Calculations’’ section for more details.)

Great circle distance. The shortest distance between two points on the surface of a sphere overthe surface of that sphere.

Mode of transportation. The type of transportation used for moving the shipment to itsdomestic destination. For exports, the domestic destination was the port of exit.

Mode Definitions

In the instructions to the respondent, we defined the possible modes as follows:

1. Parcel delivery/courier/U.S. Postal Service. Delivery services that carry letters, parcels,packages, and other small shipments that typically weigh less than 100 pounds. Includes busparcel delivery service.

2. Private truck. Trucks operated by a temporary or permanent employee of an establishmentor the buyer/receiver of the shipment.

3. For-hire truck. Trucks that carry freight for a fee collected from the shipper, recipient of theshipment, or an arranger of the transportation.

4. Railroad. Any common carrier or private railroad.

5. Shallow draft vessels. Barges, ships, or ferries operating primarily on rivers and canals; inharbors, the Great Lakes, the Saint Lawrence Seaway; the Intra-coastal Waterway, the InsidePassage to Alaska, major bays and inlets; or in the ocean close to the shoreline.

6. Deep draft vessel. Barges, ships, or ferries operating primarily in the open ocean. Shippingon the Great Lakes and the Saint Lawrence Seaway is classified with shallow draft vessels.

7. Pipeline. Movements of oil, petroleum, gas, slurry, etc., through pipelines that extend toother establishments or locations beyond the shipper’s establishment. Aqueducts for themovement of water are not included.

8. Air. Commercial or private aircraft, and all air service for shipments that typically weigh morethan 100 pounds. Includes air freight and air express.

9. Other mode. Any mode not listed above.

10. Unknown. The shipment was not carried by a parcel delivery/courier/U.S. Postal Service, andthe respondent could not determine what mode of transportation was used.

In the tables, we have used additional terms for mode, which we define as follows:

1. Air (includes truck and air). Shipments that used air or a combination of truck and air.

2. Single modes. Shipments using only one of the above-listed modes, except parcel or otherand unknown.

3. Multiple modes. Shipments for which two or more of the following modes of transportationwere used:

Private truckFor-hire truckRailShallow draft vesselDeep draft vesselPipeline

In addition, Parcel, U.S. Postal Service, or Courier shipments are considered multiple modesbecause this category includes all parcel shipments whether on the ground or via air tendered

2002 Commodity Flow Survey xiTransportation—Commodity Flow Survey


to a parcel or express carrier. In defining this mode, we did not combine these shipments withany other reported mode because by their nature, Parcel, U.S. Postal Service or Courier arealready multimodal. For example, if the respondent reported a shipment’s mode of transporta-tion as ‘‘parcel’’ and ‘‘air,’’ we treated the shipment as parcel only. Also in the CFS reports, the‘‘Truck and Rail’’ and ‘‘Rail and Water’’ combinations included under ‘‘Multiple Modes’’ may notreflect all the movement of trailers or containers by rail and at least one other mode of trans-portation. Since the shipper may not always know the modal combinations used to transportthe goods, some shipments moving by more than one mode may be reported as a singlemode shipment. This may result in underestimation of multimodal shipments in the CFS.

4. Other multiple modes. Shipments using any other mode combinations not specificallylisted in the tables.

5. Other and unknown modes. Shipments for which modes were not reported, or werereported by the respondent as ‘‘Other’’ or ‘‘Unknown.’’

6. Truck. Shipments using for-hire truck only, private truck only, or a combination of for-hiretruck and private truck.

7. Water. Shipments using shallow draft vessel only, deep draft vessel only, or Great Lakes ves-sel only. Combinations of these modes, such as shallow draft vessel and Great Lakes vesselare included as ‘‘Other multiple modes.’’ (Note: By definition, ‘‘shallow draft,’’ ‘‘Great Lakes,’’and ‘‘deep draft’’ are mutually exclusive.)

8. Great Lakes. In the tables in this publication, ‘‘Great Lakes’’ appears as a single mode.ORNL’s transportation network and mileage calculation system allowed for separate mileagecalculations for Great Lakes between the origin and destination ZIP Codes.

Other Definitions and Terms

Shipment. A shipment is a single movement of goods, commodities, or products from an estab-lishment to a single customer or to another establishment owned or operated by the same com-pany as the originating establishment (e.g., a warehouse, distribution center, or retail or wholesaleoutlet). Full or partial truckloads are counted as a single shipment only if all commodities on thetruck are destined for the same location. If a truck makes multiple deliveries on a route, the goodsdelivered at each stop are counted as one shipment. Interoffice memos, payroll checks, or busi-ness correspondence are not considered shipments. Shipments such as refuse, scrap paper, waste,or recyclable materials are not considered shipments unless the establishment is in the businessof selling or providing these materials.

Standard Classification of Transported Goods (SCTG). The commodities shown in thisreport are classified using the SCTG coding system. The SCTG coding system was developedjointly by agencies of the United States and Canadian governments based on the HarmonizedCommodity Description and Coding System (Harmonized System) to address statistical needs inregard to products transported. See Appendix D for more details.

Ton-miles. The shipment weight multiplied by the mileage traveled by the shipment. Therespondents reported shipment weight in pounds. Aggregated pound-miles were converted toton-miles. Mileage was calculated as the distance between the shipment origin and destination ZIPCodes. For shipments by truck, rail, or shallow draft vessels, the mileage excludes internationalsegments. For example, mileages from Alaska to the continental United States exclude any mile-ages through Canada (see the ‘‘Mileage Calculations’’ section for more details). For trucks makingmutliple stops, the ton-miles are calculated for each delivery, and each drop-off point is treated asa final destination. Ton-miles estimates are displayed in millions.

Tons shipped. The total weight of the entire shipment. Respondents reported the weight inpounds. Aggregated pounds were converted to short-tons (2,000 pounds). For freight shipped todistribution centers for subsequent reshipment, the tonnage is counted each time the goods aretransported.

xii 2002 Commodity Flow Survey Transportation—Commodity Flow Survey


Total modal activity (Table 2 only). The overall activity (e.g., ton-miles) of a specific mode oftransportation, whether used in a single-mode shipment, or as part of a multiple-mode shipment.For example, the total modal activity for private truck is the total ton-miles carried by privatetruck in single-mode shipments, combined with the total ton-miles carried by private truck in allmultiple-mode shipments that include private truck (private truck and for-hire truck, private truckand rail, private truck and air, etc.)

ABBREVIATIONS AND SYMBOLS

The following abbreviations and symbols are used in the tables for this publication:

– Represents an estimate equal to zero or less than 1 unit of measure.D Denotes estimates withheld to avoid disclosing data of individual companies.S Estimate does not meet publication standards because of high sampling variability or

poor response quality.CFS Commodity Flow Survey.lb Pounds.n.e.c. Not elsewhere classified.NA Not applicable.

OTHER TRANSPORTATION DATA

Users of transportation data may be especially interested in the following reports:

Vehicle Inventory and Use Survey covers state and U.S. level statistics on the physical andoperational characteristics of the nation’s truck, van, minivan, and sport utility vehicle population.Some of the types of data collected include number of vehicles, major use, body type, annualmiles, model year, vehicle size, fuel type, operator classification, engine size, range of operation,weeks operated, products carried, and hazardous materials carried. This survey shows compara-tive statistics reflecting percent changes in number of vehicles between 2002 and 1997 for mostcharacteristics.

Service Annual Survey covers firms with paid employees that provide commercial motor freighttransportation and public warehousing services. Data collected include operating revenue andoperating revenue by source, percentage of motor carrier freight revenue by commodity type, sizeof shipments handled, length of haul, and vehicle fleet inventory.

For more information on any Census Bureau product, including a description of electronic andprinted reports being issued, see the Web site or call Customer Services at 301-763-INFO (4636).

2002 Commodity Flow Survey xiiiTransportation—Commodity Flow Survey


Table 1a. Shipment Characteristics by Mode of Transportation for State of Origin: 2002[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

Mode of transportation

Value Tons Ton�miles1

2002(million dollars) Percent

2002(thousands) Percent

2002(millions) Percent

Average milesper shipment

Total 115 396�� 100.0 232 544 100.0 107 728 100.0 340

Single modes 105 265�� 91.2 218 532 94.0 104 456 97.0 152

Truck2 92 849�� 80.5 163 776 70.4 29 198 27.1 136For�hire truck 58 863�� 51.0 77 281 33.2 19 399 18.0 488Private truck 33 871�� 29.4 86 431 37.2 9 780 9.1 64

Rail 8 528�� 7.4 45 536 19.6 S S 865

Water 1 096�� 1.0 8 635 3.7 11 112 10.3 1 287Shallow draft 1 096�� 1.0 8 635 3.7 11 112 10.3 1 287Great Lakes –�� – – – – – –Deep draft –�� – – – – – –

Air (includes truck and air) S�� S S S S S 1 429Pipeline3 S�� S S S S S S

Multiple modes 7 211�� 6.2 1 485 .6 1 824 1.7 746

Parcel, U.S. Postal Service or courier 5 910�� 5.1 295 .1 223 .2 746Truck and rail S�� S 241 .1 291 .3 1 269Truck and water 51�� – S S 41 – 1 827Rail and water S�� S S S S S 1 316Other multiple modes S�� S S S S S 1 798

Other and unknown modes 2 920�� 2.5 S S S S S

– Represents data cell equal to zero or less than 1 unit of measure.S Estimate does not meet publication standards because of high sampling variability or poor response quality.

1Ton�miles estimates are based on estimated distances traveled along a modeled transportation network. See "Mileage Calculations" section for additional information.2"Truck" as a single mode includes shipments that were made by only private truck, only for�hire truck, or a combination of private truck and for�hire truck.3Estimates for pipeline exclude shipments of crude petroleum.

Note: Value�of�shipments estimates have not been adjusted for price changes. Appendix B tables provide estimated measures of sampling variability. The Introduction and appendixes giveinformation on confidentially protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

Note: Coverage for the 2002 Commodity Flow Survey (CFS) differs from the previous surveys due to a change from the 1987 Standard Industrial Classification System to the 1997 NorthAmerican Industry Classification System and other survey improvements. Therefore, data users are urged to use caution when comparing 2002 CFS estimates with estimates from prior years.

Table 1b. Shipment Characteristics by Mode of Transportation for State of Origin: Percent ofTotal for 2002 and 1997

[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys. Because of rounding, estimates may not be additive]

Mode of transportationValue (percent) Tons (percent) Ton�miles1 (percent)

2002 1997 2002 1997 2002 1997

Total 100.0�� 100.0 100.0 100.0 100.0 100.0

Single modes 91.2�� 91.0 94.0 98.3 97.0 94.2

Truck2 80.5�� 83.0 70.4 81.4 27.1 40.5For�hire truck 51.0�� 48.7 33.2 29.9 18.0 27.6Private truck 29.4�� 33.7 37.2 51.2 9.1 12.5

Rail 7.4�� 6.6 19.6 13.9 S 39.7

Water 1.0�� .9 3.7 2.8 10.3 14.0Shallow draft 1.0�� .9 3.7 2.8 10.3 14.0Great Lakes –�� – – – – –Deep draft –�� – – – – –

Air (includes truck and air) S�� .4 S – S –Pipeline3 S�� S S S S S

Multiple modes 6.2�� 6.6 .6 .9 1.7 S

Parcel, U.S. Postal Service or courier 5.1�� 5.8 .1 .1 .2 .3Truck and rail S�� .6 .1 .3 .3 1.4Truck and water –�� S S S – SRail and water S�� S S S S SOther multiple modes S�� S S S S S

Other and unknown modes 2.5�� 2.5 S .8 S 1.4





Transportation�Commodity Flow Survey Iowa 1Bureau of Transportation Statistics and U.S. Census Bureau, 2002 Economic Census

Table 2. Shipment Characteristics by Total Modal Activity for State of Origin: 2002[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

Mode of transportation1

Ton�miles2



Total 107 728�� 100.0 340

Truck 29 198�� 27.1 136Rail S�� S 865Shallow draft 11 112�� 10.3 1 287Great Lakes –�� – –Deep draft –�� – –

Air S�� S 1 429Parcel, U.S. Postal Service or courier S�� S 126Pipeline3 S�� S SOther and unknown modes S�� S S


1Estimates represent activity for a given mode across single and multiple mode shipments. For example, "Truck" ton�miles includes total ton�miles for shipments moving only by truck plus ton�miles for truck segments of multiple mode shipments.

2Ton�miles estimates are based on estimated distances traveled along a modeled transportation network. See"Mileage Calculations" section for additional information.

3Estimates exclude shipments of crude petroleum (SCTG 16).

Note: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsamplingerror, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

Note: Coverage for the 2002 Commodity Flow Survey (CFS) differs from the previous surveys due to a change fromthe 1987 Standard Industrial Classification System to the 1997 North American Industry Classification System and other surveyimprovements. Therefore, data users are urged to use caution when comparing 2002 CFS estimates with estimates from prioryears.

2 Iowa Transportation�Commodity Flow SurveyBureau of Transportation Statistics and U.S. Census Bureau, 2002 Economic Census

Table 3. Shipment Characteristics by Mode of Transportation and Distance Shipped for Stateof Origin: 2002

[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

Mode of transportation and distance shipped1

(based on Great Circle Distance)





Total 115 396�� 100.0 232 544 100.0 107 728 100.0

Less than 50 miles 18 235�� 15.8 101 398 43.6 1 826 1.750 to 99 miles 9 061�� 7.9 24 576 10.6 2 095 1.9100 to 249 miles 22 784�� 19.7 25 136 10.8 5 309 4.9250 to 499 miles 19 354�� 16.8 17 599 7.6 8 069 7.5500 to 749 miles 14 269�� 12.4 14 665 6.3 11 646 10.8

750 to 999 miles 15 990�� 13.9 18 873 8.1 22 787 21.21,000 to 1,499 miles 11 296�� 9.8 S S S S1,500 to 1,999 miles 4 298�� 3.7 1 744 .7 3 448 3.22,000 miles or more 109�� – 10 – 32 –

Single modes 105 265�� 100.0 218 532 100.0 104 456 100.0


750 to 999 miles 14 483�� 13.8 17 797 8.1 21 350 20.41,000 to 1,499 miles 9 841�� 9.3 S S S S1,500 to 1,999 miles 3 529�� 3.4 1 681 .8 3 319 3.22,000 miles or more S�� S S S S S

Truck3 92 849�� 100.0 163 776 100.0 29 198 100.0


750 to 999 miles 11 045�� 11.9 4 245 2.6 4 332 14.81,000 to 1,499 miles 6 335�� 6.8 2 694 1.6 3 838 13.11,500 to 1,999 miles 2 820�� 3.0 862 .5 1 629 5.62,000 miles or more S�� S S S S S

For�hire truck 58 863�� 100.0 77 281 100.0 19 399 100.0

Less than 50 miles 4 676�� 7.9 35 573 46.0 611 3.250 to 99 miles 3 392�� 5.8 9 557 12.4 835 4.3100 to 249 miles 11 294�� 19.2 12 937 16.7 2 706 13.9250 to 499 miles 11 305�� 19.2 8 053 10.4 3 484 18.0500 to 749 miles 10 226�� 17.4 4 375 5.7 3 285 16.9

750 to 999 miles 9 573�� 16.3 3 588 4.6 3 627 18.71,000 to 1,499 miles 6 023�� 10.2 2 544 3.3 3 621 18.71,500 to 1,999 miles 2 366�� 4.0 653 .8 1 230 6.32,000 miles or more S�� S S S S S

Private truck 33 871�� 100.0 86 431 100.0 9 780 100.0

Less than 50 miles 11 527�� 34.0 54 884 63.5 1 024 10.550 to 99 miles 5 114�� 15.1 13 302 15.4 1 095 11.2100 to 249 miles 8 427�� 24.9 8 399 9.7 1 602 16.4250 to 499 miles 4 830�� 14.3 4 319 5.0 1 780 18.2500 to 749 miles 1 765�� 5.2 S S S S

750 to 999 miles 1 452�� 4.3 650 .8 697 7.11,000 to 1,499 miles 302�� .9 147 .2 214 2.21,500 to 1,999 miles 453�� 1.3 S S S S2,000 miles or more –�� – – – – –

Rail 8 528�� 100.0 45 536 100.0 S S

Less than 50 miles S�� S 256 .6 S S50 to 99 miles 92�� 1.1 S S S S100 to 249 miles 813�� 9.5 3 296 7.2 906 1.4250 to 499 miles 1 247�� 14.6 4 942 10.9 2 698 4.2500 to 749 miles 934�� 10.9 4 510 9.9 3 935 6.1

750 to 999 miles 2 063�� 24.2 6 170 13.5 7 240 11.31,000 to 1,499 miles S�� S S S S S1,500 to 1,999 miles 277�� 3.2 816 1.8 1 682 2.62,000 miles or more –�� – – – – –

Water 1 096�� 100.0 8 635 100.0 11 112 100.0

Less than 50 miles S�� S S S S S50 to 99 miles –�� – – – – –100 to 249 miles –�� – – – – –250 to 499 miles –�� – – – – –500 to 749 miles S�� S S S S S

750 to 999 miles 960�� 87.5 7 379 85.5 9 773 88.01,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –

Shallow draft 1 096�� 100.0 8 635 100.0 11 112 100.0


750 to 999 miles 960�� 87.5 7 379 85.5 9 773 88.01,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –

See footnotes at end of table.


Table 3. Shipment Characteristics by Mode of Transportation and Distance Shipped for Stateof Origin: 2002�Con.








Single modes�Con.

Great Lakes –�� – – – – –

Less than 50 miles –�� – – – – –50 to 99 miles –�� – – – – –100 to 249 miles –�� – – – – –250 to 499 miles –�� – – – – –500 to 749 miles –�� – – – – –

750 to 999 miles –�� – – – – –1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –

Deep draft –�� – – – – –



Air (includes truck and air) S�� S S S S S

Less than 50 miles –�� – – – – –50 to 99 miles S�� S S S S S100 to 249 miles S�� S S S S S250 to 499 miles S�� S S S S S500 to 749 miles S�� S 2 13.0 3 10.9

750 to 999 miles S�� S S S S S1,000 to 1,499 miles S�� S S S S S1,500 to 1,999 miles S�� S S S S S2,000 miles or more S�� S S S S S

Pipeline4 S�� S S S S S

Less than 50 miles S�� S S S S S50 to 99 miles S�� S S S S S100 to 249 miles S�� S S S S S250 to 499 miles S�� S S S S S500 to 749 miles –�� – – – S S

750 to 999 miles –�� – – – S S1,000 to 1,499 miles –�� – – – S S1,500 to 1,999 miles –�� – – – S S2,000 miles or more –�� – – – S S

Multiple modes 7 211�� 100.0 1 485 100.0 1 824 100.0

Less than 50 miles 219�� 3.0 S S S S50 to 99 miles 203�� 2.8 14 .9 S S100 to 249 miles 1 246�� 17.3 92 6.2 20 1.1250 to 499 miles 1 134�� 15.7 83 5.6 39 2.1500 to 749 miles 861�� 11.9 63 4.2 50 2.8

750 to 999 miles 1 357�� 18.8 S S S S1,000 to 1,499 miles 1 335�� 18.5 136 9.1 196 10.81,500 to 1,999 miles 757�� 10.5 58 3.9 120 6.62,000 miles or more S�� S 9 .6 S S

Parcel, U.S. Postal Service or courier 5 910�� 100.0 295 100.0 223 100.0

Less than 50 miles 211�� 3.6 9 3.2 – .250 to 99 miles 203�� 3.4 10 3.3 1 .4100 to 249 miles 971�� 16.4 63 21.4 12 5.5250 to 499 miles 1 070�� 18.1 58 19.7 27 12.2500 to 749 miles 816�� 13.8 44 14.8 33 14.7

750 to 999 miles 1 085�� 18.4 48 16.2 49 21.91,000 to 1,499 miles 1 085�� 18.4 49 16.5 75 33.61,500 to 1,999 miles 407�� 6.9 11 3.7 21 9.22,000 miles or more S�� S S S S S

Truck and rail S�� S 241 100.0 291 100.0

Less than 50 miles –�� – – – – –50 to 99 miles S�� S S S S S100 to 249 miles S�� S S S S S250 to 499 miles S�� S S S S S500 to 749 miles 40�� 3.5 18 7.6 17 5.7

750 to 999 miles S�� S S S S S1,000 to 1,499 miles S�� S S S S S1,500 to 1,999 miles S�� S S S S S2,000 miles or more –�� – – – – –

Truck and water 51�� 100.0 S S 41 100.0


750 to 999 miles S�� S S S S S1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles S�� S S S S S2,000 miles or more S�� S S S S S



Table 3. Shipment Characteristics by Mode of Transportation and Distance Shipped for Stateof Origin: 2002�Con.








Multiple modes�Con.

Rail and water S�� S S S S S


750 to 999 miles S�� S S S S S1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –

Other multiple modes S�� S S S S S

Less than 50 miles S�� S S S S S50 to 99 miles –�� – – – – –100 to 249 miles –�� – – – – –250 to 499 miles –�� – – – – –500 to 749 miles –�� – – – – –

750 to 999 miles S�� S S S S S1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles S�� S S S S S2,000 miles or more –�� – – – – –

Other and unknown modes 2 920�� 100.0 S S S S

Less than 50 miles 1 643�� 56.3 S S S S50 to 99 miles 170�� 5.8 1 083 8.6 73 5.1100 to 249 miles S�� S 252 2.0 44 3.0250 to 499 miles S�� S S S S S500 to 749 miles 206�� 7.1 S S S S

750 to 999 miles S�� S S S S S1,000 to 1,499 miles 120�� 4.1 S S S S1,500 to 1,999 miles S�� S S S S S2,000 miles or more –�� – – – – –


1Shipments are grouped into distance categories based on Great Circle Distance (GCD). GCD is the shortest distance between 2 points on the surface of a sphere over the surface of thatsphere.





Table 4. Shipment Characteristics by Mode of Transportation and Shipment Weight for State ofOrigin: 2002


Mode of transportation and shipment weight






Total 115 396�� 100.0 232 544 100.0 107 728 100.0 340

Less than 50 lb 7 939�� 6.9 223 .1 100 – 39550 to 99 lb 2 237�� 1.9 187 – 60 – 302100 to 499 lb 5 442�� 4.7 927 .4 264 .2 272500 to 749 lb 1 663�� 1.4 379 .2 112 .1 290750 to 999 lb 1 195�� 1.0 340 .1 99 – 294

1,000 to 9,999 lb 17 367�� 15.1 8 400 3.6 2 041 1.9 26510,000 to 49,999 lb 61 618�� 53.4 92 287 39.7 21 871 20.3 22350,000 to 99,999 lb 8 254�� 7.2 63 663 27.4 4 756 4.4 74100,000 lb or more 9 682�� 8.4 66 138 28.4 S S 671

Single modes 105 265�� 100.0 218 532 100.0 104 456 100.0 152

Less than 50 lb 4 128�� 3.9 96 – 9 – S50 to 99 lb 1 259�� 1.2 119 – 20 – 152100 to 499 lb 4 003�� 3.8 711 .3 179 .2 228500 to 749 lb 1 557�� 1.5 367 .2 104 .1 279750 to 999 lb 1 165�� 1.1 330 .2 96 – 291

1,000 to 9,999 lb 16 781�� 15.9 8 099 3.7 1 977 1.9 26210,000 to 49,999 lb 59 577�� 56.6 90 514 41.4 21 354 20.4 22250,000 to 99,999 lb 7 821�� 7.4 60 484 27.7 4 609 4.4 75100,000 lb or more 8 974�� 8.5 57 813 26.5 S S 794

Truck2 92 849�� 100.0 163 776 100.0 29 198 100.0 136

Less than 50 lb 2 126�� 2.3 94 – 7 – S50 to 99 lb 1 066�� 1.1 118 – 18 – 142100 to 499 lb 3 850�� 4.1 702 .4 166 .6 214500 to 749 lb 1 515�� 1.6 363 .2 100 .3 271750 to 999 lb 1 121�� 1.2 328 .2 92 .3 280

1,000 to 9,999 lb 16 538�� 17.8 8 049 4.9 1 967 6.7 26310,000 to 49,999 lb 58 815�� 63.3 89 724 54.8 20 965 71.8 22050,000 to 99,999 lb 6 935�� 7.5 60 046 36.7 4 270 14.6 72100,000 lb or more 884�� 1.0 4 354 2.7 S S 328

For�hire truck 58 863�� 100.0 77 281 100.0 19 399 100.0 488

Less than 50 lb 267�� .5 5 – 3 – 65850 to 99 lb 265�� .5 13 – 9 – 681100 to 499 lb 1 818�� 3.1 172 .2 113 .6 648500 to 749 lb 788�� 1.3 97 .1 69 .4 713750 to 999 lb 607�� 1.0 98 .1 68 .3 697

1,000 to 9,999 lb 9 499�� 16.1 2 577 3.3 1 538 7.9 64310,000 to 49,999 lb 40 798�� 69.3 40 106 51.9 14 122 72.8 37850,000 to 99,999 lb 4 211�� 7.2 33 224 43.0 2 761 14.2 84100,000 lb or more 609�� 1.0 990 1.3 718 3.7 761

Private truck 33 871�� 100.0 86 431 100.0 9 780 100.0 64

Less than 50 lb 1 858�� 5.5 89 .1 4 – 4050 to 99 lb 801�� 2.4 105 .1 10 .1 81100 to 499 lb 2 028�� 6.0 529 .6 52 .5 94500 to 749 lb 723�� 2.1 265 .3 31 .3 113750 to 999 lb 501�� 1.5 226 .3 21 .2 93

1,000 to 9,999 lb 6 972�� 20.6 5 447 6.3 418 4.3 8110,000 to 49,999 lb 17 994�� 53.1 49 588 57.4 6 841 69.9 11450,000 to 99,999 lb 2 722�� 8.0 26 820 31.0 1 509 15.4 56100,000 lb or more S�� S S S S S 199

Rail 8 528�� 100.0 45 536 100.0 S S 865

Less than 50 lb –�� – – – – – –50 to 99 lb S�� S S S S S 58100 to 499 lb S�� S S S S S 680500 to 749 lb –�� – – – – – –750 to 999 lb –�� – – – – – –

1,000 to 9,999 lb S�� S S S S S 52210,000 to 49,999 lb 644�� 7.6 270 .6 S S 1 13150,000 to 99,999 lb S�� S 432 .9 S S 677100,000 lb or more 7 052�� 82.7 44 831 98.5 S S 866

Water 1 096�� 100.0 8 635 100.0 11 112 100.0 1 287

Less than 50 lb –�� – – – – – –50 to 99 lb –�� – – – – – –100 to 499 lb –�� – – – – – –500 to 749 lb –�� – – – – – –750 to 999 lb –�� – – – – – –

1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb S�� S S S S S 1 277100,000 lb or more 1 038�� 94.7 8 629 99.9 11 105 99.9 1 287

Shallow draft 1 096�� 100.0 8 635 100.0 11 112 100.0 1 287


1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb S�� S S S S S 1 277100,000 lb or more 1 038�� 94.7 8 629 99.9 11 105 99.9 1 287



Table 4. Shipment Characteristics by Mode of Transportation and Shipment Weight for State ofOrigin: 2002�Con.








Single modes�Con.

Great Lakes –�� – – – – – –


1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –

Deep draft –�� – – – – – –



Air (includes truck and air) S�� S S S S S 1 429

Less than 50 lb S�� S 2 10.0 3 9.3 1 42950 to 99 lb S�� S 1 5.5 1 5.3 1 423100 to 499 lb S�� S S S S S 1 429500 to 749 lb S�� S S S S S 1 148750 to 999 lb S�� S S S S S 2 208

1,000 to 9,999 lb S�� S S S S S 1 24910,000 to 49,999 lb S�� S S S S S 2 46450,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –

Pipeline3 S�� S S S S S S

Less than 50 lb –�� – – – S S S50 to 99 lb –�� – – – S S S100 to 499 lb S�� S S S S S S500 to 749 lb –�� – – – S S S750 to 999 lb S�� S S S S S S

1,000 to 9,999 lb S�� S S S S S S10,000 to 49,999 lb S�� S S S S S S50,000 to 99,999 lb –�� – – – S S S100,000 lb or more –�� – – – S S S

Multiple modes 7 211�� 100.0 1 485 100.0 1 824 100.0 746

Less than 50 lb 3 638�� 50.5 115 7.8 91 5.0 74650 to 99 lb 890�� 12.3 48 3.2 39 2.1 805100 to 499 lb 1 283�� 17.8 120 8.1 85 4.6 684500 to 749 lb 83�� 1.2 7 .5 6 .3 865750 to 999 lb 18�� .2 5 .3 S S 741

1,000 to 9,999 lb 8�� .1 2 .1 3 .2 2 09510,000 to 49,999 lb 1 151�� 16.0 231 15.5 292 16.0 1 32550,000 to 99,999 lb S�� S S S S S 519100,000 lb or more S�� S S S S S 1 322

Parcel, U.S. Postal Service or courier 5 910�� 100.0 295 100.0 223 100.0 746

Less than 50 lb 3 638�� 61.6 115 39.1 91 40.6 74650 to 99 lb 890�� 15.1 48 16.2 39 17.4 805100 to 499 lb 1 282�� 21.7 120 40.8 85 37.9 683500 to 749 lb 83�� 1.4 7 2.4 6 2.7 865750 to 999 lb 17�� .3 4 1.5 3 1.3 678

1,000 to 9,999 lb S�� S S S S S 31410,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –

Truck and rail S�� S 241 100.0 291 100.0 1 269

Less than 50 lb S�� S S S S S 35250 to 99 lb –�� – – – – – –100 to 499 lb S�� S S S S S 352500 to 749 lb –�� – – – – – –750 to 999 lb –�� – – – – – –

1,000 to 9,999 lb 6�� .5 1 .5 1 .5 1 29910,000 to 49,999 lb S�� S 202 83.7 253 86.7 1 28250,000 to 99,999 lb S�� S S S S S 519100,000 lb or more S�� S S S S S 955

Truck and water 51�� 100.0 S S 41 100.0 1 827

Less than 50 lb S�� S S S S S 1 80550 to 99 lb –�� – – – – – –100 to 499 lb S�� S S S S S 2 135500 to 749 lb –�� – – – – – –750 to 999 lb S�� S S S S S 2 419

1,000 to 9,999 lb S�� S S S S S 8 78910,000 to 49,999 lb 48�� 95.0 S S 39 95.5 1 52350,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –



Table 4. Shipment Characteristics by Mode of Transportation and Shipment Weight for State ofOrigin: 2002�Con.









Rail and water S�� S S S S S 1 316


1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb –�� – – – – – –100,000 lb or more S�� S S S S S 1 316

Other multiple modes S�� S S S S S 1 798


1,000 to 9,999 lb S�� S S S S S 1 87510,000 to 49,999 lb S�� S S S S S 550,000 to 99,999 lb –�� – – – – – –100,000 lb or more S�� S S S S S 1 968


Less than 50 lb S�� S S S – – S50 to 99 lb S�� S S S S S S100 to 499 lb S�� S S S S S S500 to 749 lb S�� S 5 – S S 241750 to 999 lb S�� S S S S S S

1,000 to 9,999 lb 579�� 19.8 299 2.4 61 4.2 33310,000 to 49,999 lb 890�� 30.5 1 543 12.3 224 15.5 S50,000 to 99,999 lb S�� S S S S S 46100,000 lb or more S�� S S S S S 11






Table 5a. Shipment Characteristics by Two�Digit Commodity for State of Origin: 2002[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

SCTGcode Commodity description






Total2 115 396�� 100.0 232 544 100.0 107 728 100.0 340

01 Live animals and live fish S�� S S S S S 53102 Cereal grains 4 584�� 4.0 52 568 22.6 S S S03 Other agricultural products 2 782�� 2.4 14 382 6.2 7 789 7.2 65104 Animal feed and products of animal origin, n.e.c. 4 980�� 4.3 18 400 7.9 6 075 5.6 S05 Meat, fish, seafood, and their preparations 8 438�� 7.3 4 077 1.8 S S 494

06 Milled grain products and preparations, and bakery products 1 995�� 1.7 2 643 1.1 1 788 1.7 45207 Other prepared foodstuffs and fats and oils 10 437�� 9.0 23 714 10.2 11 744 10.9 72608 Alcoholic beverages 1 603�� 1.4 2 721 1.2 1 836 1.7 6609 Tobacco products –�� – – – – – –10 Monumental or building stone –�� – – – – – –

11 Natural sands S�� S S S S S S12 Gravel and crushed stone 333�� .3 48 174 20.7 S S 5713 Nonmetallic minerals n.e.c. S�� S S S S S S14 Metallic ores and concentrates S�� S S S S S 22215 Coal S�� S S S S S 6

17 Gasoline and aviation turbine fuel S�� S 2 192 .9 S S 3618 Fuel oils 541�� .5 2 500 1.1 S S 3919 Coal and petroleum products, n.e.c. 1 923�� 1.7 5 975 2.6 960 .9 S20 Basic chemicals 457�� .4 S S S S S21 Pharmaceutical products 1 548�� 1.3 80 – 83 – 505

22 Fertilizers 1 834�� 1.6 13 070 5.6 S S 7623 Chemical products and preparations, n.e.c. 6 873�� 6.0 1 343 .6 1 035 1.0 34024 Plastics and rubber 6 110�� 5.3 2 996 1.3 1 783 1.7 39325 Logs and other wood in the rough S�� S S S S S 19826 Wood products 2 264�� 2.0 1 464 .6 353 .3 195

27 Pulp, newsprint, paper, and paperboard 491�� .4 784 .3 243 .2 S28 Paper or paperboard articles S�� S S S S S S29 Printed products 1 228�� 1.1 S S S S 77830 Textiles, leather, and articles of textiles or leather 2 705�� 2.3 S S S S 91931 Nonmetallic mineral products 897�� .8 7 032 3.0 1 019 .9 195

32 Base metal in primary or semifinished forms and in finished basicshapes 3 955�� 3.4 3 823 1.6 1 602 1.5 302

33 Articles of base metal 2 103�� 1.8 848 .4 474 .4 29234 Machinery 14 166�� 12.3 3 485 1.5 1 723 1.6 41635 Electronic and other electrical equipment and components and office

equipment 2 071�� 1.8 151 – 87 – 45236 Motorized and other vehicles (including parts) 11 611�� 10.1 2 222 1.0 1 423 1.3 615

37 Transportation equipment, n.e.c. 69�� – 108 – 89 – 62138 Precision instruments and apparatus S�� S 4 – 4 – 39639 Furniture, mattresses and mattress supports, lamps, lighting fittings, and

illuminated signs 1 234�� 1.1 386 .2 343 .3 69740 Miscellaneous manufactured products 4 624�� 4.0 635 .3 347 .3 32941 Waste and scrap S�� S S S S S S43 Mixed freight 8 398�� 7.3 2 895 1.2 686 .6 S�� Commodity unknown 238�� .2 388 .2 S S 553


1Ton�miles estimates are based on estimated distances traveled along a modeled transportation network. See "Mileage Calculations" section for additional information.2Estimates exclude shipments of crude petroleum (SCTG 16).




Table 5b. Shipment Characteristics by Two�Digit Commodity for State of Origin: Percent ofTotal for 2002 and 1997



Value (percent) Tons (percent) Ton�miles1 (percent)

2002 1997 2002 1997 2002 1997

Total2 100.0�� 100.0 100.0 100.0 100.0 100.0

01 Live animals and live fish S�� .7 S .3 S .102 Cereal grains 4.0�� 2.9 22.6 14.6 S 22.703 Other agricultural products 2.4�� 6.5 6.2 8.8 7.2 9.104 Animal feed and products of animal origin, n.e.c 4.3�� 7.1 7.9 11.1 5.6 10.505 Meat, fish, seafood, and their preparations 7.3�� 8.4 1.8 2.0 S 3.9

06 Milled grain products and preparations, and bakery products 1.7�� 4.9 1.1 3.2 1.7 8.207 Other prepared foodstuffs and fats and oils 9.0�� 6.4 10.2 6.8 10.9 15.508 Alcoholic beverages 1.4�� 1.5 1.2 1.0 1.7 2.309 Tobacco products –�� .2 – – – –10 Monumental or building stone –�� S – S – S

11 Natural sands S�� – S 5.1 S S12 Gravel and crushed stone .3�� .2 20.7 17.6 S 4.813 Nonmetallic minerals n.e.c. S�� S S 2.1 S .414 Metallic ores and concentrates S�� S S S S S15 Coal S�� S S S S S

17 Gasoline and aviation turbine fuel S�� 1.7 .9 3.5 S .418 Fuel oils .5�� .6 1.1 1.3 S S19 Coal and petroleum products, n.e.c. 1.7�� .6 2.6 1.4 .9 .420 Basic chemicals .4�� .5 S .3 S .321 Pharmaceutical products 1.3�� 1.1 – – – –

22 Fertilizers 1.6�� .8 5.6 1.7 S 1.023 Chemical products and preparations, n.e.c. 6.0�� 5.0 .6 .6 1.0 1.324 Plastics and rubber 5.3�� 3.8 1.3 .8 1.7 1.825 Logs and other wood in the rough S�� S S S S S26 Wood products 2.0�� 1.4 .6 .5 .3 .5

27 Pulp, newsprint, paper, and paperboard .4�� .6 .3 .4 .2 .628 Paper or paperboard articles S�� 1.0 S .4 S .429 Printed products 1.1�� 1.6 S .3 S .730 Textiles, leather, and articles of textiles or leather 2.3�� .8 S – S –31 Nonmetallic mineral products .8�� 1.4 3.0 8.1 .9 3.8

32 Base metal in primary or semifinished forms and in finished basicshapes 3.4�� 3.5 1.6 1.4 1.5 1.2

33 Articles of base metal 1.8�� 2.7 .4 .6 .4 1.034 Machinery 12.3�� 9.5 1.5 .7 1.6 1.835 Electronic and other electrical equipment and components and office

equipment 1.8�� 2.9 – .2 – .336 Motorized and other vehicles (including parts) 10.1�� 11.3 1.0 .9 1.3 2.1

37 Transportation equipment, n.e.c. –�� .2 – – – .138 Precision instruments and apparatus S�� .4 – – – –39 Furniture, mattresses and mattress supports, lamps, lighting fittings, and

illuminated signs 1.1�� 1.2 .2 .2 .3 .540 Miscellaneous manufactured products 4.0�� 3.6 .3 .4 .3 .841 Waste and scrap S�� .3 S 1.0 S .943 Mixed freight 7.3�� S 1.2 S .6 S�� Commodity unknown .2�� .6 .2 S S S






Table 6. Shipment Characteristics by Two�Digit Commodity and Mode of Transportation forState of Origin: 2002


SCTG code, description, and mode of transportation






ALL COMMODITIES

Total2 115 396�� 100.0 232 544 100.0 107 728 100.0 340

Single modes 105 265�� 91.2 218 532 94.0 104 456 97.0 152

Truck3 92 849�� 80.5 163 776 70.4 29 198 27.1 136For�hire truck 58 863�� 51.0 77 281 33.2 19 399 18.0 488Private truck 33 871�� 29.4 86 431 37.2 9 780 9.1 64

Rail 8 528�� 7.4 45 536 19.6 S S 865

Water 1 096�� 1.0 8 635 3.7 11 112 10.3 1 287Shallow draft 1 096�� 1.0 8 635 3.7 11 112 10.3 1 287Great Lakes –�� – – – – – –Deep draft –�� – – – – – –


Multiple modes 7 211�� 6.2 1 485 .6 1 824 1.7 746

Parcel, U.S. Postal Service or courier 5 910�� 5.1 295 .1 223 .2 746Truck and rail S�� S 241 .1 291 .3 1 269Truck and water 51�� – S S 41 – 1 827Rail and water S�� S S S S S 1 316Other multiple modes S�� S S S S S 1 798


SCTG 01, LIVE ANIMALS AND LIVE FISH

Total S�� S S S S S 531

Single modes S�� S S S S S 531

Truck3 S�� S S S S S 531For�hire truck S�� S S S S S 856Private truck S�� S S S S S 300

Rail –�� – – – – – –

Water –�� – – – – – –Shallow draft –�� – – – – – –Great Lakes –�� – – – – – –Deep draft –�� – – – – – –

Air (includes truck and air) –�� – – – – – –Pipeline4 –�� – – – S S S

Multiple modes –�� – – – – – –

Parcel, U.S. Postal Service or courier –�� – – – – – –Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes –�� – – – – – –

SCTG 02, CEREAL GRAINS

Total 4 584�� 100.0 52 568 100.0 S S S

Single modes S�� S 44 408 84.5 S S S

Truck3 1 343�� 29.3 S S 811 1.5 SFor�hire truck S�� S S S S S SPrivate truck 653�� 14.3 8 441 16.1 S S 41

Rail S�� S S S S S 1 798

Water 543�� 11.9 5 665 10.8 7 281 13.3 1 287Shallow draft 543�� 11.9 5 665 10.8 7 281 13.3 1 287Great Lakes –�� – – – – – –Deep draft –�� – – – – – –

Air (includes truck and air) S�� S S S S S 1 243Pipeline4 –�� – – – S S S

Multiple modes S�� S S S S S 801

Parcel, U.S. Postal Service or courier S�� S S S S S 725Truck and rail S�� S S S S S 560Truck and water –�� – – – – – –Rail and water S�� S S S S S 1 209Other multiple modes –�� – – – – – –

Other and unknown modes S�� S S S S S S



Table 6. Shipment Characteristics by Two�Digit Commodity and Mode of Transportation forState of Origin: 2002�Con.








SCTG 03, OTHER AGRICULTURAL PRODUCTS

Total 2 782�� 100.0 14 382 100.0 7 789 100.0 651

Single modes 2 444�� 87.9 14 208 98.8 7 748 99.5 S

Truck3 1 380�� 49.6 7 954 55.3 408 5.2 49For�hire truck S�� S S S S S SPrivate truck S�� S S S 361 4.6 51

Rail S�� S S S S S 520

Water 547�� 19.7 2 896 20.1 3 733 47.9 1 287Shallow draft 547�� 19.7 2 896 20.1 3 733 47.9 1 287Great Lakes –�� – – – – – –Deep draft –�� – – – – – –


Multiple modes S�� S S S S S 1 020

Parcel, U.S. Postal Service or courier S�� S S S S S 1 020Truck and rail S�� S S S S S 407Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes S�� S S S S S 21

SCTG 04, ANIMAL FEED AND PRODUCTS OF ANIMALORIGIN, N.E.C.

Total 4 980�� 100.0 18 400 100.0 6 075 100.0 S

Single modes 4 791�� 96.2 17 606 95.7 5 075 83.5 S

Truck3 4 309�� 86.5 14 727 80.0 2 536 41.7 SFor�hire truck 1 502�� 30.2 4 329 23.5 1 483 24.4 321Private truck 2 807�� 56.4 10 398 56.5 S S S

Rail 482�� 9.7 2 879 15.6 2 539 41.8 878


Air (includes truck and air) S�� S S S S S 745Pipeline4 –�� – – – S S S


Parcel, U.S. Postal Service or courier S�� S 1 – 1 – 1 041Truck and rail S�� S S S S S 1 175Truck and water –�� – – – – – –Rail and water S�� S S S S S 1 406Other multiple modes S�� S S S S S 1 968


SCTG 05, MEAT, FISH, SEAFOOD, AND THEIRPREPARATIONS

Total 8 438�� 100.0 4 077 100.0 S S 494

Single modes 8 222�� 97.4 4 023 98.7 S S 496

Truck3 8 190�� 97.1 4 002 98.2 S S 495For�hire truck 6 896�� 81.7 3 153 77.4 S S 785Private truck 1 291�� 15.3 S S S S S





Parcel, U.S. Postal Service or courier S�� S S S S S STruck and rail S�� S S S S S 2 082Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –












SCTG 06, MILLED GRAIN PRODUCTS ANDPREPARATIONS, AND BAKERY PRODUCTS

Total 1 995�� 100.0 2 643 100.0 1 788 100.0 452

Single modes 1 995�� 100.0 2 643 100.0 1 788 100.0 452

Truck3 1 766�� 88.5 1 621 61.3 814 45.5 404For�hire truck 1 717�� 86.1 1 582 59.9 802 44.8 505Private truck 49�� 2.5 39 1.5 S S 97

Rail 229�� 11.5 1 022 38.7 975 54.5 942






SCTG 07, OTHER PREPARED FOODSTUFFS AND FATSAND OILS

Total 10 437�� 100.0 23 714 100.0 11 744 100.0 726

Single modes 9 866�� 94.5 20 988 88.5 11 594 98.7 333

Truck3 8 226�� 78.8 13 693 57.7 S S 291For�hire truck 4 143�� 39.7 6 809 28.7 2 705 23.0 456Private truck S�� S S S S S 213

Rail 1 640�� 15.7 7 294 30.8 6 533 55.6 889


Air (includes truck and air) S�� S S S S S 927Pipeline4 S�� S S S S S S


Parcel, U.S. Postal Service or courier S�� S S S S S 1 003Truck and rail S�� S S S S S 2 187Truck and water S�� S S S S S 2 135Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 08, ALCOHOLIC BEVERAGES

Total 1 603�� 100.0 2 721 100.0 1 836 100.0 66

Single modes 1 603�� 100.0 2 721 100.0 1 836 100.0 66

Truck3 700�� 43.6 991 36.4 143 7.8 46For�hire truck 218�� 13.6 571 21.0 127 6.9 207Private truck 482�� 30.0 420 15.4 S S 39

Rail 903�� 56.3 1 730 63.6 1 692 92.2 967
















SCTG 09, TOBACCO PRODUCTS

Total –�� – – – – – –

Single modes –�� – – – – – –

Truck3 –�� – – – – – –For�hire truck –�� – – – – – –Private truck –�� – – – – – –

Rail –�� – – – – – –






SCTG 10, MONUMENTAL OR BUILDING STONE

Total –�� – – – – – –

Single modes –�� – – – – – –

Truck3 –�� – – – – – –For�hire truck –�� – – – – – –Private truck –�� – – – – – –

Rail –�� – – – – – –






SCTG 11, NATURAL SANDS

Total S�� S S S S S S

Single modes S�� S S S S S S

Truck3 S�� S S S S S SFor�hire truck S�� S S S S S 40Private truck S�� S S S S S S

Rail –�� – – – – – –
















SCTG 12, GRAVEL AND CRUSHED STONE

Total 333�� 100.0 48 174 100.0 S S 57

Single modes 330�� 99.3 47 755 99.1 S S 57

Truck3 324�� 97.5 47 499 98.6 S S 56For�hire truck 150�� 45.0 S S 1 149 37.7 SPrivate truck 175�� 52.6 25 406 52.7 S S S







SCTG 13, NONMETALLIC MINERALS N.E.C.



Truck3 S�� S S S S S 87For�hire truck S�� S S S S S 137Private truck 50�� 17.8 S S S S S





Parcel, U.S. Postal Service or courier S�� S S S S S 913Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 2�� .7 19 .7 S S S

SCTG 14, METALLIC ORES AND CONCENTRATES



Truck3 S�� S S S S S 222For�hire truck –�� – – – – – –Private truck S�� S S S S S 222

Rail –�� – – – – – –
















SCTG 15, COAL




Rail –�� – – – – – –






SCTG 17, GASOLINE AND AVIATION TURBINE FUEL

Total S�� S 2 192 100.0 S S 36

Single modes S�� S 2 133 97.3 S S 29

Truck3 S�� S 2 133 97.3 S S 29For�hire truck S�� S 2 118 96.6 S S 28Private truck S�� S S S S S 37

Rail –�� – – – – – –






SCTG 18, FUEL OILS

Total 541�� 100.0 2 500 100.0 S S 39

Single modes 541�� 100.0 2 500 100.0 S S 39

Truck3 541�� 100.0 2 500 100.0 S S 39For�hire truck S�� S S S S S 31Private truck S�� S S S S S S

Rail –�� – – – – – –
















SCTG 19, COAL AND PETROLEUM PRODUCTS, N.E.C.

Total 1 923�� 100.0 5 975 100.0 960 100.0 S

Single modes 1 910�� 99.3 5 933 99.3 945 98.5 S

Truck3 1 624�� 84.4 5 367 89.8 866 90.2 SFor�hire truck S�� S S S S S SPrivate truck S�� S 2 327 39.0 S S S

Rail –�� – – – – – –




Parcel, U.S. Postal Service or courier S�� S S S S S 220Truck and rail –�� – – – – – –Truck and water S�� S S S S S 666Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 20, BASIC CHEMICALS

Total 457�� 100.0 S S S S S

Single modes 445�� 97.3 S S S S S

Truck3 438�� 95.7 S S S S 178For�hire truck 287�� 62.8 S S S S 491Private truck S�� S S S S S 85




Multiple modes 11�� 2.5 2 .1 3 .4 1 551

Parcel, U.S. Postal Service or courier S�� S S S S S 1 563Truck and rail 11�� 2.4 2 .1 3 .4 1 437Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 21, PHARMACEUTICAL PRODUCTS

Total 1 548�� 100.0 80 100.0 83 100.0 505

Single modes 1 325�� 85.6 71 88.4 77 92.8 476

Truck3 1 288�� 83.2 65 81.7 65 79.1 435For�hire truck 907�� 58.6 59 74.3 58 69.9 717Private truck 381�� 24.6 S S S S 111




Multiple modes 189�� 12.2 S S S S 519

Parcel, U.S. Postal Service or courier 189�� 12.2 S S S S 519Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –












SCTG 22, FERTILIZERS

Total 1 834�� 100.0 13 070 100.0 S S 76

Single modes 1 834�� 100.0 13 070 100.0 S S 76

Truck3 1 678�� 91.5 11 656 89.2 926 47.9 SFor�hire truck S�� S S S S S 164Private truck 1 318�� 71.9 9 366 71.7 S S S







SCTG 23, CHEMICAL PRODUCTS ANDPREPARATIONS, N.E.C.

Total 6 873�� 100.0 1 343 100.0 1 035 100.0 340

Single modes 5 961�� 86.7 1 213 90.4 881 85.1 241

Truck3 5 096�� 74.2 1 042 77.6 697 67.3 223For�hire truck S�� S 901 67.1 S S 654Private truck 820�� 11.9 142 10.6 32 3.1 S





Parcel, U.S. Postal Service or courier 13�� .2 1 – 1 – 884Truck and rail S�� S S S S S 1 290Truck and water S�� S S S S S 1 805Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 24, PLASTICS AND RUBBER

Total 6 110�� 100.0 2 996 100.0 1 783 100.0 393

Single modes 5 650�� 92.5 2 930 97.8 1 725 96.7 S

Truck3 5 067�� 82.9 2 029 67.7 884 49.6 242For�hire truck 3 818�� 62.5 1 629 54.4 819 45.9 522Private truck 1 248�� 20.4 400 13.4 65 3.7 120



Air (includes truck and air) 6�� .1 S S – – 2 361Pipeline4 –�� – – – S S S

Multiple modes 381�� 6.2 35 1.2 32 1.8 772

Parcel, U.S. Postal Service or courier 368�� 6.0 32 1.1 25 1.4 771Truck and rail S�� S S S S S 2 082Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes S�� S S S S S 1 875

Other and unknown modes 79�� 1.3 30 1.0 S S S











SCTG 25, LOGS AND OTHER WOOD IN THE ROUGH




Rail –�� – – – – – –






SCTG 26, WOOD PRODUCTS

Total 2 264�� 100.0 1 464 100.0 353 100.0 195

Single modes 2 246�� 99.2 1 456 99.5 352 99.7 200

Truck3 2 246�� 99.2 1 456 99.5 352 99.6 198For�hire truck 1 272�� 56.2 445 30.4 251 71.0 491Private truck S�� S 1 011 69.1 101 28.6 S

Rail –�� – – – – – –


Air (includes truck and air) –�� – – – S S 1 364Pipeline4 –�� – – – S S S




SCTG 27, PULP, NEWSPRINT, PAPER, ANDPAPERBOARD

Total 491�� 100.0 784 100.0 243 100.0 S

Single modes 490�� 99.8 783 99.8 243 100.0 S

Truck3 424�� 86.2 614 78.4 142 58.5 SFor�hire truck 306�� 62.4 567 72.3 136 56.2 250Private truck S�� S S S S S S





Parcel, U.S. Postal Service or courier S�� S S S S S 94Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes S�� S S S S S 5












SCTG 28, PAPER OR PAPERBOARD ARTICLES



Truck3 S�� S S S S S SFor�hire truck S�� S S S S S SPrivate truck S�� S S S S S 43

Rail –�� – – – – – –


Air (includes truck and air) S�� S S S S S 823Pipeline4 –�� – – – S S S




SCTG 29, PRINTED PRODUCTS

Total 1 228�� 100.0 S S S S 778

Single modes 689�� 56.1 S S S S 290

Truck3 689�� 56.1 S S S S 290For�hire truck S�� S S S S S 531Private truck S�� S S S S S 19

Rail –�� – – – – – –



Multiple modes 534�� 43.5 S S S S 829

Parcel, U.S. Postal Service or courier 534�� 43.5 S S S S 829Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 5�� .4 S S S S 31

SCTG 30, TEXTILES, LEATHER, AND ARTICLES OFTEXTILES OR LEATHER

Total 2 705�� 100.0 S S S S 919

Single modes 2 437�� 90.1 S S S S 655

Truck3 2 199�� 81.3 S S S S 474For�hire truck S�� S S S S S 783Private truck 1 783�� 65.9 54 8.6 30 4.5 S




Multiple modes 217�� 8.0 6 .9 5 .8 1 049

Parcel, U.S. Postal Service or courier 217�� 8.0 6 .9 5 .8 1 049Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –












SCTG 31, NONMETALLIC MINERAL PRODUCTS

Total 897�� 100.0 7 032 100.0 1 019 100.0 195

Single modes 888�� 99.0 7 031 100.0 1 019 99.9 117

Truck3 831�� 92.6 6 185 88.0 776 76.1 108For�hire truck 603�� 67.2 S S 611 60.0 170Private truck S�� S S S S S 52

Rail 56�� 6.2 845 12.0 S S 284




Parcel, U.S. Postal Service or courier S�� S S S S S 996Truck and rail S�� S S S S S 2 189Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 32, BASE METAL IN PRIMARY OR SEMIFINISHEDFORMS AND IN FINISHED BASIC SHAPES

Total 3 955�� 100.0 3 823 100.0 1 602 100.0 302

Single modes 3 921�� 99.1 3 784 99.0 1 599 99.8 278

Truck3 3 634�� 91.9 2 945 77.0 964 60.2 267For�hire truck 3 098�� 78.3 2 033 53.2 800 50.0 466Private truck 499�� 12.6 892 23.3 162 10.1 107

Rail 274�� 6.9 839 21.9 635 39.6 751





Other and unknown modes 25�� .6 39 1.0 S S 38

SCTG 33, ARTICLES OF BASE METAL

Total 2 103�� 100.0 848 100.0 474 100.0 292

Single modes 1 915�� 91.0 830 97.9 466 98.3 155

Truck3 1 860�� 88.4 757 89.3 371 78.3 140For�hire truck 1 493�� 71.0 588 69.4 348 73.4 528Private truck 363�� 17.3 167 19.7 23 4.8 S

Rail 31�� 1.5 72 8.5 S S 1 188


Air (includes truck and air) S�� S 1 – S S 1 281Pipeline4 –�� – – – S S S

Multiple modes 169�� 8.0 10 1.2 6 1.3 581

Parcel, U.S. Postal Service or courier 169�� 8.0 10 1.2 6 1.3 581Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 20�� .9 8 1.0 2 .4 S











SCTG 34, MACHINERY

Total 14 166�� 100.0 3 485 100.0 1 723 100.0 416

Single modes 13 347�� 94.2 2 630 75.4 1 620 94.0 463

Truck3 12 860�� 90.8 2 579 74.0 1 548 89.8 394For�hire truck 10 895�� 76.9 1 847 53.0 1 410 81.8 807Private truck 1 897�� 13.4 711 20.4 123 7.2 S




Multiple modes 337�� 2.4 29 .8 58 3.4 495

Parcel, U.S. Postal Service or courier 240�� 1.7 9 .3 5 .3 487Truck and rail 55�� .4 14 .4 28 1.6 1 964Truck and water S�� S S S S S 4 054Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 483�� 3.4 S S S S S

SCTG 35, ELECTRONIC AND OTHER ELECTRICALEQUIPMENT AND COMPONENTS AND OFFICEEQUIPMENT

Total 2 071�� 100.0 151 100.0 87 100.0 452

Single modes 1 485�� 71.7 132 87.2 76 86.7 S

Truck3 1 350�� 65.2 129 85.6 71 81.2 SFor�hire truck 974�� 47.0 88 58.2 66 75.9 821Private truck S�� S S S 5 5.3 S

Rail –�� – – – – – –



Multiple modes 516�� 24.9 13 8.5 7 7.5 836

Parcel, U.S. Postal Service or courier S�� S 6 4.2 5 5.4 836Truck and rail S�� S S S S S 261Truck and water S�� S S S S S 4 541Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 36, MOTORIZED AND OTHER VEHICLES(INCLUDING PARTS)

Total 11 611�� 100.0 2 222 100.0 1 423 100.0 615

Single modes 10 173�� 87.6 2 082 93.7 1 330 93.5 485

Truck3 10 169�� 87.6 2 082 93.7 1 330 93.5 445For�hire truck 6 349�� 54.7 1 530 68.8 1 123 78.9 748Private truck 3 817�� 32.9 552 24.8 207 14.6 244

Rail –�� – – – – – –



Multiple modes 951�� 8.2 73 3.3 67 4.7 685

Parcel, U.S. Postal Service or courier 892�� 7.7 33 1.5 26 1.8 685Truck and rail 59�� .5 40 1.8 41 2.9 965Truck and water S�� S S S S S 10 919Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –












SCTG 37, TRANSPORTATION EQUIPMENT, N.E.C.

Total 69�� 100.0 108 100.0 89 100.0 621

Single modes 69�� 100.0 108 100.0 89 100.0 621

Truck3 26�� 37.6 36 33.3 18 20.0 501For�hire truck 11�� 15.6 15 13.6 8 9.2 551Private truck 15�� 22.0 21 19.7 10 10.8 468

Rail 43�� 62.4 72 66.7 72 80.0 855






SCTG 38, PRECISION INSTRUMENTS AND APPARATUS

Total S�� S 4 100.0 4 100.0 396

Single modes S�� S 2 55.5 2 58.0 756

Truck3 S�� S S S S S SFor�hire truck S�� S S S S S 622Private truck S�� S S S S S S

Rail –�� – – – – – –



Multiple modes S�� S 2 44.5 1 42.0 339

Parcel, U.S. Postal Service or courier S�� S 2 44.5 1 42.0 339Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 39, FURNITURE, MATTRESSES AND MATTRESSSUPPORTS, LAMPS, LIGHTING FITTINGS, ANDILLUMINATED SIGNS

Total 1 234�� 100.0 386 100.0 343 100.0 697

Single modes 1 217�� 98.6 385 99.8 342 99.9 701

Truck3 1 216�� 98.5 385 99.8 342 99.8 699For�hire truck 1 057�� 85.6 339 87.7 316 92.1 833Private truck 159�� 12.9 47 12.1 S S 462

Rail –�� – – – – – –



Multiple modes S�� S S S – .1 645

Parcel, U.S. Postal Service or courier S�� S S S – .1 645Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –












SCTG 40, MISCELLANEOUS MANUFACTUREDPRODUCTS

Total 4 624�� 100.0 635 100.0 347 100.0 329

Single modes 3 114�� 67.3 553 87.1 296 85.2 S

Truck3 3 080�� 66.6 552 87.0 294 84.8 SFor�hire truck 2 126�� 46.0 373 58.7 251 72.2 797Private truck S�� S 179 28.2 43 12.5 S

Rail –�� – – – – – –



Multiple modes S�� S S S 49 14.0 691

Parcel, U.S. Postal Service or courier S�� S S S 48 13.8 691Truck and rail S�� S S S S S 2 470Truck and water S�� S S S S S 2 419Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 26�� .6 S S S S S

SCTG 41, WASTE AND SCRAP



Truck3 S�� S S S S S SFor�hire truck S�� S S S S S SPrivate truck S�� S S S S S 10

Rail –�� – – – – – –






SCTG 43, MIXED FREIGHT

Total 8 398�� 100.0 2 895 100.0 686 100.0 S

Single modes 7 839�� 93.3 2 816 97.3 670 97.7 S

Truck3 7 834�� 93.3 2 813 97.2 668 97.4 SFor�hire truck 1 387�� 16.5 617 21.3 330 48.0 466Private truck 6 447�� 76.8 2 196 75.8 339 49.4 52

















COMMODITY UNKNOWN

Total 238�� 100.0 388 100.0 S S 553

Single modes 234�� 98.4 377 97.3 S S 398

Truck3 129�� 54.4 S S S S 395For�hire truck 88�� 37.0 63 16.2 26 13.0 560Private truck 41�� 17.4 S S S S 187


Water S�� S S S S S 1 335Shallow draft S�� S S S S S 1 335Great Lakes –�� – – – – – –Deep draft –�� – – – – – –






1Ton�miles estimates are based on estimated distances traveled along a modeled transportation network. See "Mileage Calculations" section for additional information.2Estimates exclude shipments of crude petroleum (SCTG 16).3"Truck" as a single mode includes shipments that were made by only private truck, only for�hire truck, or a combination of private truck and for�hire truck.4Estimates for pipeline exclude shipments of crude petroleum.




Table 7. Outbound Shipment Characteristics by State of Destination for State of Origin: 2002[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

State of destination





Total 115 396�� 100.0 232 544 100.0 107 728 100.0

NEW ENGLAND STATES

Connecticut 715�� .6 283 .1 388 .4Maine 153�� .1 130 – 152 .1Massachusetts 727�� .6 253 .1 308 .3New Hampshire 180�� .2 S S S SRhode Island 85�� – S S S SVermont 64�� – S S S S

MIDDLE ATLANTIC STATES

New Jersey 1 450�� 1.3 832 .4 900 .8New York 1 594�� 1.4 947 .4 883 .8Pennsylvania 2 437�� 2.1 1 877 .8 1 824 1.7

EAST NORTH CENTRAL STATES

Illinois 10 568�� 9.2 14 393 6.2 3 688 3.4Indiana 2 252�� 2.0 1 249 .5 481 .4Michigan 3 637�� 3.2 2 349 1.0 1 236 1.1Ohio 3 233�� 2.8 S S S SWisconsin 4 432�� 3.8 6 719 2.9 1 600 1.5

WEST NORTH CENTRAL STATES

Iowa 29 432�� 25.5 119 848 51.5 4 384 4.1Kansas 2 290�� 2.0 1 909 .8 675 .6Minnesota 4 628�� 4.0 7 526 3.2 1 600 1.5Missouri 3 717�� 3.2 3 020 1.3 933 .9Nebraska 4 192�� 3.6 7 364 3.2 968 .9North Dakota 1 201�� 1.0 749 .3 552 .5South Dakota 922�� .8 1 395 .6 310 .3

SOUTH ATLANTIC STATES

Delaware 57�� – 11 – 11 –District of Columbia S�� S S S S SFlorida 2 174�� 1.9 660 .3 918 .9Georgia 1 787�� 1.5 1 050 .5 1 045 1.0Maryland 2 283�� 2.0 609 .3 635 .6North Carolina 1 770�� 1.5 505 .2 541 .5South Carolina 872�� .8 517 .2 626 .6Virginia 591�� .5 290 .1 305 .3West Virginia 119�� .1 114 – 88 –

EAST SOUTH CENTRAL STATES

Alabama 940�� .8 950 .4 985 .9Kentucky 945�� .8 731 .3 471 .4Mississippi 665�� .6 572 .2 514 .5Tennessee 2 103�� 1.8 1 175 .5 882 .8

WEST SOUTH CENTRAL STATES

Arkansas 1 009�� .9 1 112 .5 770 .7Louisiana 2 548�� 2.2 12 598 5.4 16 164 15.0Oklahoma 1 421�� 1.2 1 305 .6 849 .8Texas 5 567�� 4.8 4 175 1.8 4 317 4.0

MOUNTAIN STATES

Arizona 1 069�� .9 1 779 .8 2 955 2.7Colorado 1 137�� 1.0 1 079 .5 880 .8Idaho 470�� .4 109 – 153 .1Montana 522�� .5 156 – 179 .2Nevada 183�� .2 S S S SNew Mexico 274�� .2 293 .1 354 .3Utah 208�� .2 98 – 121 .1Wyoming S�� S 86 – 65 –

PACIFIC STATES

Alaska S�� S S S S SCalifornia 6 444�� 5.6 S S S SHawaii S�� S S S S SOregon 632�� .5 S S S SWashington 1 441�� 1.2 331 .1 636 .6


1Ton�miles estimates are based on estimated distances traveled along a modeled transportation network. See "Mileage Calculations" section for additional information.




Table 8. Inbound Shipment Characteristics by State of Origin for State of Destination: 2002[Estimates are based on data from the 2002 Commodity Flow Survey. Because of rounding, estimates may not be additive]

State of origin





Total 88 753�� 100.0 190 663 100.0 43 043 100.0

NEW ENGLAND STATES

Connecticut 461�� .5 S S S SMaine 102�� .1 S S S SMassachusetts 296�� .3 S S S SNew Hampshire 116�� .1 S S S SRhode Island S�� S S S S SVermont 22�� – 2 – 3 –


New Jersey 1 326�� 1.5 S S S SNew York 1 233�� 1.4 366 .2 356 .8Pennsylvania 1 128�� 1.3 242 .1 214 .5


Illinois 6 393�� 7.2 9 040 4.7 1 757 4.1Indiana 3 382�� 3.8 2 865 1.5 1 036 2.4Michigan 2 334�� 2.6 898 .5 443 1.0Ohio 2 711�� 3.1 1 420 .7 848 2.0Wisconsin 4 152�� 4.7 3 339 1.8 985 2.3


Iowa 29 432�� 33.2 119 848 62.9 4 384 10.2Kansas 2 016�� 2.3 4 590 2.4 1 571 3.6Minnesota 4 732�� 5.3 7 052 3.7 1 620 3.8Missouri 4 216�� 4.8 5 649 3.0 1 766 4.1Nebraska 5 386�� 6.1 3 874 2.0 566 1.3North Dakota 218�� .2 263 .1 148 .3South Dakota 1 805�� 2.0 4 604 2.4 819 1.9


Delaware S�� S 17 – 18 –District of Columbia S�� S S S S SFlorida 484�� .5 S S S SGeorgia 783�� .9 532 .3 546 1.3Maryland S�� S S S S SNorth Carolina 1 087�� 1.2 466 .2 483 1.1South Carolina 704�� .8 197 .1 209 .5Virginia 476�� .5 244 .1 268 .6West Virginia 103�� .1 153 – 124 .3


Alabama S�� S 282 .1 250 .6Kentucky 723�� .8 223 .1 125 .3Mississippi 343�� .4 342 .2 271 .6Tennessee 1 500�� 1.7 389 .2 261 .6


Arkansas 510�� .6 345 .2 233 .5Louisiana 1 283�� 1.4 1 360 .7 1 545 3.6Oklahoma 548�� .6 905 .5 527 1.2Texas 2 282�� 2.6 1 811 .9 1 751 4.1

MOUNTAIN STATES

Arizona 295�� .3 57 – 97 .2Colorado 301�� .3 151 – 115 .3Idaho 158�� .2 201 .1 296 .7Montana 40�� – 151 – 182 .4Nevada 70�� – 8 – 14 –New Mexico 15�� – 90 – 105 .2Utah 147�� .2 S S S SWyoming 189�� .2 15 056 7.9 13 486 31.3

PACIFIC STATES

Alaska –�� – – – – –California 3 317�� 3.7 395 .2 733 1.7Hawaii S�� S S S S SOregon 238�� .3 S S S SWashington 401�� .5 S S S S


1Ton�miles estimates are based on estimated distances traveled along a modeled transportation network. See "Mileage Calculations" section for additional information.




Discussion of Survey Changes andComparing Estimates

The following tables provide comparisons of the 2002 and 1997 Commodity Flow Survey (CFS)estimates.

Data users are urged to use caution in comparing estimates from different survey years due to thechanges that have occurred in sample design, industry coverage, methodology, commodity classi-fication coding systems, geography, and sample sizes. Appendix A presents change in these areasby survey year.

INDUSTRY COVERAGE CHANGES

Changes to the 2002 CFS include moving the industry coverage from a Standard Industrial Classi-fication (SIC) based definition in the 1997 CFS to a North American Industry Classification System(NAICS) based definition for the 2002 survey. For the 2002 CFS, this meant that selected indus-tries previously covered in the 1997 CFS using the SIC definitions, were now out-of-scope to the2002 CFS industry coverage based on the NAICS definitions. The major industries not covered bythe 2002 CFS that were included in the 1997 CFS are Logging (NAICS 11331); Newspaper Periodi-cal, Book, and Database Publishers (NAICS 5111); and Music Publishers (NAICS 51223).

To make the 1997 CFS estimates comparable with the 2002 CFS, the 1997 CFS estimates havebeen revised by removing shipments from establishments in the following industries:

SIC 2411 Logging

SIC 2711 Newspapers: Publishing, or Publishing and PrintingSIC 2721 Periodicals: Publishing, or Publishing and PrintingSIC 2731 Books: Publishing, or Publishing and PrintingSIC 2741 Miscellaneous PublishingSIC 2771 Greeting Cards

We were not able to adjust the 1997 CFS estimates to account the NAICS coverage changes whenonly part of a SIC moved out-of-scope. For example, a wholesale industry in-scope to the 1997CFS—SIC 5171 (Petroleum Bulk Stations and Terminals)—included Heating Oil Sold Via RetailMethod, which is now classified as Retail (NAICS 454311) and is out-of-scope of the 2002 CFS.The majority of the industry remains in-scope to the 2002 CFS industry coverage, therefore wemade no adjustment to the 1997 CFS estimates.

No adjustments have been made to the 1993 CFS estimates.

Detailed information about NAICS can be found at www.census.gov/epcd/www/naics.html.

AUXILIARY ESTABLISHMENT COVERAGE CHANGES

The 2002 CFS improved the coverage of auxiliary establishments. Auxiliary establishments aredefined as warehouses and managing offices of multiestablishment companies, which have non-auxiliary establishments that are in-scope to CFS or are classified in retail trade. For the 1997 CFSsampling, managing offices had to have sales or inventory levels of greater than zero in order tobe considered for selection. However, research conducted prior to the 2002 CFS showed that notall managing offices with shipping activity in the 1997 CFS indicated sales or inventories in the1997 Economic Census. Therefore, to provide a more comprehensive coverage of auxiliaries, forthe 2002 CFS managing offices were subjected to sampling, regardless of sales or inventories.

COMPARISON DATA AND STATISTICAL VALIDITY

Changes from the 1997 to 2002 CFS include a decrease in sample size, from approximately100,000 establishments for the 1997 CFS to about 50,000 establishments for the 2002 survey.

28 Iowa Transportation—Commodity Flow Survey


One consequence of the decreased sample size was a substantial increase in the sampling vari-ability for estimates of period-to-period change produced at full detail levels for mode and com-modity. Because of the increased variability in many of these categories, one cannot conclude witha high degree of confidence that changes were significant. For a more detailed discussion of sam-pling variability, see Appendix B. We have provided period-to-period comparisons at the following,higher levels of aggregation for mode of transportation and commodity since the impact ofincreased sampling variability is less at those levels. For consistency, these aggregation levels arealso now used in our Metropolitan Area and Export tables, where appropriate.

Iowa 29Transportation—Commodity Flow Survey


Table 9. Shipment Characteristics by Mode of Transportation for State of Origin: 2002 and1997



Value Tons Ton�miles1 Average miles per shipment

2002(milliondollars)


Percentchange

2002(thousands)

1997(thousands)

Percentchange

2002(millions)

1997(millions)

Percentchange 2002 1997

Percentchange

Total 115 396�� 109 871 5.0 232 544 218 789 6.3 107 728 56 882 89.4 340 276 23.3

Single modes 105 265�� 99 936 5.3 218 532 214 967 1.7 104 456 53 604 94.9 152 111 37.1

Truck2 92 849�� 91 224 1.8 163 776 178 197 –8.1 29 198 23 010 26.9 136 101 34.5Rail 8 528�� 7 224 18.0 45 536 30 467 49.5 S 22 570 S 865 836 3.5Water 1 096�� 975 12.4 8 635 6 064 42.4 11 112 7 968 39.5 1 287 1 203 6.9Air (includes truck and air) S�� 460 S S 20 S S 20 S 1 429 1 107 29.1Pipeline3 S�� S S S S S S S S S S S

Multiple modes 7 211�� 7 201 .1 1 485 2 046 –27.4 1 824 S S 746 631 18.3

Parcel, U.S. Postal Service or courier 5 910� 6 364 –7.1 295 296 –.3 223 171 30.6 746 630 18.3Truck and rail S�� 691 S 241 700 –65.6 291 802 –63.7 1 269 1 319 –3.8All other multiple modes 174�� S S S S S S S S 1 778 S S

Other and unknown modes 2 920�� 2 734 6.8 S 1 775 S S 801 S S 74 S





Table 10. Shipment Characteristics by Commodity Group for State of Origin: 2002 and 1997[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys. Because of rounding, estimates may not be additive]


Value Tons Ton�miles1 Average miles per shipment



Percentchange

2002(thousands)

1997(thousands)

Percentchange

2002(millions)

1997(millions)

Percentchange 2002 1997

Percentchange

Total2 115 396�� 109 871 5.0 232 544 218 789 6.3 107 728 56 882 89.4 340 276 23.3

01�05 Agricultural products andfish 21 372�� 28 051 –23.8 89 538 80 425 11.3 S 26 362 S 293 114 156.2

06�09 Grains, alcohol, and tobaccoproducts 14 036�� 14 227 –1.3 29 078 24 025 21.0 15 368 14 783 4.0 582 143 307.1

10�14 Stones, nonmetallic minerals,and metallic ores 644�� S S 56 177 54 564 3.0 S 3 215 S 59 54 9.2

15�19 Coal and petroleumproducts 3 066�� 3 184 –3.7 10 738 13 594 –21.0 1 211 633 91.2 S 26 S

20�24 Basic chemicals, chemical,and pharmaceuticalproducts 16 823�� 12 222 37.6 19 810 7 590 161.0 5 536 2 521 119.6 352 222 58.7

25�30 Logs, wood products, andtextile and leather 7 396�� 5 995 23.4 5 064 3 520 43.9 2 235 1 253 78.4 597 550 8.5

31�34 Base metal and machinery 21 122�� 18 839 12.1 15 189 23 686 –35.9 4 819 4 428 8.8 346 278 24.635�38 Electronic, motorized

vehicles, and precisioninstruments 16 405�� 16 212 1.2 2 486 2 505 –.8 1 603 1 410 13.7 518 326 58.7

39�43 Furniture, mixed freight andmisc. manufactured prod. 14 295�� 9 386 52.3 4 077 5 406 –24.6 1 406 1 497 –6.0 268 481 –44.2

�� Commodity unknown 238�� 677 –64.9 388 S S S S S 553 143 285.7






Appendix A.Comparability With the 1993 and 1997Commodity Flow Surveys

The following tables show a comparison of the key characteristics among the 1993, 1997, and2002 Commodity Flow Surveys.

Industry Coverage

1993 1997 2002

Based on 1987 SIC Based on 1987 SIC Based on 1997 NAICS1

Manufacturing (excludingPrinting Trade Services (SIC279))

Manufacturing (excludingPrinting Trade Services (SIC279))

Manufacturing (excludingPrepress Services (NAICS323122))

Mining (except mining services(SICs 108, 124, 138, 148)and oil and gas extraction(SICs 131 and 132))

Mining (except mining services(SICs 108,124, 138, 148) andoil and gas extraction (SICs 131and 132))

Mining (except supportactivities (NAICS 213) andoil and gas extraction (NAICS211))

Wholesale (merchants andmanufacturers’ salesbranches and government-owned liquor stores)

Wholesale (merchants andmanufacturers’ sales branchesand government-owned liquorstores)

Wholesale (merchants andmanufacturers’ sales branchesand government-owned liquorstores)

Retail catalog and mail orderhouses

Retail catalog and mail orderhouses

Retail electronic shopping and mailorder houses

Auxiliaries (e.g., warehouses) Auxiliaries (e.g., warehouses) Auxiliaries2 (e.g., warehouses)1Because of changes in the classification of establishments between SIC and NAICS, establishments classified in

the following industries were covered in the 1993 and 1997 surveys, but not in the 2002 survey: NAICS 11331, Logging;NAICS 5111, Newspaper, Periodical, Book, and Database Publishers; and NAICS 51223, Music Publishers. Detailedinformation about NAICS can be found on the Census Bureau Web site at:http://www.census.gov/epcd/www/naics.html.

2Coverage of auxiliaries has been expanded for the 2002 CFS. In comparison, for the 1997 CFS, the number ofin-scope managing offices was reduced to a large extent based on the results of the 1992 Economic Census. For the1997 CFS, a managing office was considered in-scope only if it had sales or end-of-year inventories in the 1992 Cen-sus. Research conducted prior to the 2002 CFS showed that not all managing offices with shipping activity in the 1997CFS indicated sales or inventories in the 1997 Economic Census. Therefore, the 1997 Economic Census results werenot used to determine scope for managing offices in the 2002 CFS. For the 2002 survey, the inclusion of an increasednumber of auxiliaries (intermediary distribution centers) which support the operations of retail stores (most of which are,themselves out-of-scope) has more of an impact on the estimates of value and tonnage and less on ton-miles.

Commodity Classification System

1993 1997 2002

Standard TransportationCommodity Classification(STCC), developed by theAssociation of AmericanRailroads (AAR)

Standard Classification ofTransported Goods (SCTG)

Standard Classification ofTransported Goods (SCTG)

Appendix A A–1Transportation—Commodity Flow Survey

Bureau of Transportation Statistics and U.S. Census Bureau, 2002 Eonomic Census

Sample Size

1993 1997 2002

Approximately 200,000establishments selected froma universe of about 790,000in-scope establishments.

Approximately 100,000establishments selected from auniverse of about 770,000in-scope establishments.

Approximately 50,000establishments selected from auniverse of about 760,000in-scope establishments.

Survey Methodology

1993 1997 2002

Respondents reported for asample of their individualoutbound shipments for a2-week period during each ofthe four calendar quarters ofthe reference year.

Respondents reported for asample of their individualoutbound shipments for a 1-weekperiod during each of the fourcalendar quarters of thereference year.

Respondents reported for a sampleof their individual outboundshipments for a 1-week periodduring each of the fourcalendar quarters of the referenceyear.

Respondents reported keycharacteristics for eachsampled shipment

Respondents reported keycharacteristics for each sampledshipment.

Respondents reported keycharacteristics for each sampledshipment.

Reported Mode of Transportation

1993 1997 2002

For-hire truck For-hire truck For-hire truckPrivate truck Private truck Private truckRail Rail RailAir Air AirInland Water Shallow draft vessel Shallow draft vesselDeep Sea Water Deep draft vessel Deep draft vesselPipeline Pipeline PipelineParcel, U.S. Postal Service, orcourier

Parcel, U.S. Postal Service, orcourier

Parcel, U.S. Postal Service, or cou-rier

Other Other OtherUnknown Unknown Unknown

A–2 Appendix A Transportation—Commodity Flow Survey


Data Items Requested

1993 1997 2002

For each shipment: For each shipment: For each shipment:

Total value Total value Total valueTotal weight Total weight Total weightCommodity that contributes themost to the shipment’s weight(STCC)

Commodity that contributes themost to the shipment’s weight(SCTG)

Commodity that contributes themost to the shipment’s weight(SCTG)

All known modes oftransportation



Single origin (assumed to bethe mailing address unlessthe respondent provided adifferent physical locationaddress)

Single origin (assumed to be themailing address unless therespondent provided a differentphysical location address)

Single origin (assumed to be themailing address unless therespondent provided a differentphysical location address)

Destination Destination DestinationContainerized (Y/N) Containerized (Y/N)Hazardous material (Y/N) Hazardous material (UN/NA) code Hazardous material (UN/NA) code

Export (Y/N) Export (Y/N) Export (Y/N)If export: mode of export,foreign city and country ofdestination; U.S. port, airport,or border crossing of exit.

If export: mode of export, foreigncity and country of destination;U.S. port, airport, or bordercrossing of exit.

If export: mode of export, foreigncity and country of destination;U.S. port, airport, or bordercrossing of exit.

Appendix A A–3Transportation—Commodity Flow Survey


Appendix B.Reliability of the Estimates

The estimates in this publication may differ from the actual, unknown population values. Statisti-cians define this difference as the total error of the estimate. When describing the accuracy of sur-vey results, it is convenient to discuss total error as the sum of sampling error and nonsamplingerror. Sampling error is the average difference between the estimate and the result that would beobtained from a complete enumeration of the sampling frame conducted under the same surveyconditions. Nonsampling error encompasses all other factors that contribute to the total error of asample survey estimate.

The sampling error of the estimates in this publication can be estimated from the selected samplebecause the sample was selected using probability sampling. Common measures related to sam-pling error are the sampling variance, the standard error, and the coefficient of variation (CV). Thesampling variance is the squared difference, averaged over all possible samples of the same sizeand design, between the estimator and its average value. The standard error is the square root ofthe sampling variance. The CV expresses the standard error as a percentage of the estimate towhich it refers. This publication presents these measures in Appendix B.

Nonsampling errors are difficult to measure and can be introduced through inadequacies in thequestionnaire, nonresponse, inaccurate reporting by respondents, errors in the application of sur-vey procedures, incorrect recording of answers, and errors in data entry and processing. No mea-sures of nonsampling error are presented in this publication, however, every effort is made tominimize their effect on the estimates. Data users should take into account both the measures ofsampling error and the potential effects of nonsampling error when using these estimates.

More detailed descriptions of sampling and nonsampling errors for the 2002 CFS are provided inthe following sections.

Sampling Error

Because the estimates are based on a sample, exact agreement with results that would beobtained from a complete enumeration of all shipments made in 2002 from all establishmentsincluded on the sampling frame using the same enumeration procedures is not expected. How-ever, because probability sampling was used at each stage of selection, it is possible to estimatethe sampling variability of the survey estimates. For CFS estimates, sampling variability arisesfrom each of the three stages of sampling. (See Appendix C for a description of the sampledesign.)

The particular sample used in this survey is one of a large number of samples of the same sizethat could have been selected using the same design. If all possible samples had been surveyedunder the same conditions, an estimate of a population parameter of interest could have beenobtained from each sample. These samples give rise to a distribution of estimates for the popula-tion parameter. A statistical measure of the variability among these estimates is the standarderror, which can be approximated from any one sample. The standard error is defined as thesquare root of the variance. The coefficient of variation (or relative standard error) of an estimatoris the standard error of the estimator divided by the estimator. Note that measures of samplingvariability, such as the standard error and coefficient of variation, are estimated from the sampleand are also subject to sampling variability. (Technically, we should refer to the estimated stan-dard error or the estimated coefficient of variation of an estimator. However, for the sake of brev-ity, we have omitted this detail.) It is important to note that the standard error only measures sam-pling variability. It does not measure systematic biases of the sample. The Census Bureaurecommends that individuals using estimates contained in this report incorporate this informationinto their analyses, as sampling error could affect the conclusions drawn from these estimates.

Appendix B B–1Transportation—Commodity Flow Survey


An estimate from a particular sample and the standard error associated with the estimate can beused to construct a confidence interval. A confidence interval is a range about a given estimatorthat has a specified probability of containing the result of a complete enumeration of the samplingframe conducted under the same survey conditions. Associated with each interval is a percentageof confidence, which is interpreted as follows. If, for each possible sample, an estimate of a popu-lation parameter and its approximate standard error were obtained, then:

1. For approximately 90 percent of the possible samples, the interval from 1.645 standard errorsbelow to 1.645 standard errors above the estimate would include the result as obtained froma complete enumeration of the sampling frame conducted under the same survey conditions.

2. For approximately 95 percent of the possible samples, the interval from 1.96 standard errorsbelow to 1.96 standard errors above the estimate would include the result as obtained from acomplete enumeration of the sampling frame conducted under the same survey conditions.

To illustrate the computation of a confidence interval for an estimate of total value of ship-ments, assume that an estimate of total value is $10,750 million and the coefficient of varia-tion for this estimate is 1.8 percent, or 0.018. First obtain the standard error of the estimateby multiplying the value of shipments estimate by its coefficient of variation. For thisexample, multiply $10,750 million by 0.018. This yields a standard error of $193.5 million.The upper and lower bounds of the 90-percent confidence interval are computed as $10,750million plus or minus 1.645 times $193.5 million. Consequently, the 90-percent confidenceinterval is $10,432 million to $11,068 million. If corresponding confidence intervals were con-structed for all possible samples of the same size and design, approximately 9 out of 10 (90percent) of these intervals would contain the result obtained from a complete enumeration.

Nonsampling Error

Nonsampling error encompasses all other factors that contribute to the total error of a sample sur-vey estimate and may also occur in censuses. It is often helpful to think of nonsampling error asarising from deficiencies or mistakes in the survey process. In the CFS, nonsampling error can beattributed to many sources: inability to obtain information about all units in the sample; responseerrors; differences in the interpretation of the questions; mistakes in coding or keying the dataobtained; and other errors of collection, response, coverage, and processing. Although no directmeasurement of the potential biases due to nonsampling error has been obtained, precautionarysteps were taken in all phases of the collection, processing, and tabulation of the data in an effortto minimize their influence. The Census Bureau recommends that individuals using estimates inthis report incorporate this information into their analyses, as nonsampling error could affect theconclusions drawn from these estimates.

A potential source of bias in the estimates is nonresponse. Nonresponse is defined as the inabilityto obtain all the intended measurements or responses from all units in the sample. Four levels ofnonresponse can occur in the CFS: item, shipment, quarter (reporting week), and establishment.Item nonresponse occurs either when a question is unanswered or the response to the questionfails computer or analyst edits. Nonresponse to the shipment value or weight items is correctedby imputation, which is the procedure by which a missing value is replaced by a predicted valueobtained from an appropriate model. (See Appendix C for a description of the imputation proce-dure.) Shipment, quarter, and establishment nonresponse are used to describe the inability toobtain any of the substantive measurements about a sampled shipment, quarter, or establish-ment, respectively. Shipment and quarter nonresponse are corrected by reweighting. Reweightingallocates characteristics to the nonrespondents in proportion to the characteristics observed forthe respondents. The amount of bias introduced by this nonresponse adjustment proceduredepends on the extent to which the nonrespondents differ, characteristically, from the respon-dents. Establishment nonresponse is corrected during the estimation procedure by the industry-level adjustment weight. (See Appendix C for a description of the estimation procedure.) In mostcases of establishment nonresponse, none of the four questionnaires have been returned to theCensus Bureau, after several attempts to elicit a response. Approximately 63 percent of the estab-lishments provided at least one quarter of data that contributed to tabulation.

B–2 Appendix B Transportation—Commodity Flow Survey


Some possible sources of bias that are attributed to respondent-conducted sampling include mis-understanding the definition of a shipment, constructing an incomplete frame of shipments fromwhich to sample, ordering the shipment sampling frame by selected shipment characteristics, andselecting shipment records by a method other than the one specified in the questionnaire’sinstructions. We often contact respondents who reported shipments having an untypically largevalue or weight when compared to the rest of their reported shipments. Upon contact, if we areable to collect information on all of a given respondent’s large shipments made either for a par-ticular reporting week or for the entire quarter, then we identify these large shipments as certaintyshipments. (See Appendix C for a description of how certainty shipments are used in the estima-tion process.)

DEFINITION OF TERMS

Confidentiality

Title 13 of the United States Code authorizes the Census Bureau to conduct censuses and surveys.Section 9 of the same Title requires that any information collected from the public under theauthority of Title 13 be maintained as confidential. Section 214 of Title 13 and Sections 3559 and3571 of Title 18 of the United States Code provide for the imposition of penalties of up to 5 yearsin prison and up to $250,000 in fines for wrongful disclosure of confidential census information.In accordance with Title 13, no estimates are published that would disclose the operations of anindividual firm.

The Census Bureau’s internal Disclosure Review Board sets the confidentiality rules for all datareleases. A checklist approach is used to ensure that all potential risks to the confidentiality of thedata are considered and addressed.

Disclosure Limitation

Disclosure is the release of data that have been deemed confidential. It generally reveals informa-tion about a specific individual or establishment or permits deduction of sensitive informationabout a particular individual or establishment. Disclosure limitation is the process used to protectthe confidentiality of the survey data provided by an individual or firm. Using disclosure limitationprocedures, the Census Bureau modifies or removes the characteristics that put confidential infor-mation at risk for disclosure. Although it may appear that a table shows information about a spe-cific individual or business, the Census Bureau has taken steps to disguise or suppress the origi-nal data while making sure the results are still useful. The techniques used by the Census Bureauto protect confidentiality in tabulations vary, depending on the type of data.

Unpublished Estimates

Some unpublished estimates can be derived directly from this report by subtracting publishedestimates from their respective totals. However, the estimates obtained by such subtraction wouldbe subject to poor response, high sampling variability, or other factors that may make thempotentially misleading.

Individuals who use estimates in this report to create new estimates should cite the CensusBureau as the source of only the original estimates.

Appendix B B–3Transportation—Commodity Flow Survey


Table B–1a. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation for State of Origin: 2002

[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]


Value Tons Ton�miles

Coefficient ofvariation of

numberStandard errorof percentage





Average milesper shipment�

coefficient ofvariation

Total 5.9�� – 13.6 – 39.2 – 15.7

Single modes 6.7�� 1.7 13.9 2.6 40.4 1.5 25.2

Truck 7.1�� 2.7 11.7 4.6 12.5 6.7 24.2For�hire truck 8.3�� 2.2 21.0 4.9 12.0 4.8 9.9Private truck 11.4�� 3.0 17.0 5.6 24.6 3.3 17.2

Rail 23.5�� 1.6 49.2 5.1 S S 4.1

Water 16.8�� .2 18.7 .9 19.1 4.2 11.1Shallow draft 16.8�� .2 18.7 .9 19.1 4.2 11.1Great Lakes –�� – – – – – –Deep draft –�� – – – – – –

Air (includes truck and air) S�� S S S S S 8.4Pipeline S�� S S S S S S

Multiple modes 18.3�� 1.4 35.7 .3 40.0 1.0 6.9

Parcel, U.S. Postal Service or courier 15.5�� 1.1 16.6 – 21.2 .1 6.9Truck and rail S�� S 41.0 – 41.5 .1 14.3Truck and water 45.2�� – S S 48.7 – 34.6Rail and water S�� S S S S S 27.9Other multiple modes S�� S S S S S 29.8

Other and unknown modes 33.4�� .8 S S S S S


Note: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internetmay be found at www.census.gov/cfs.

Table B–1b. Estimated Standard Errors of Percentage for Shipment Characteristics by Mode ofTransportation for State of Origin: Percent of Total for 2002 and 1997

[Estimates are shown as percents and are based on data from the 2002 and 1997 Commodity Flow Surveys]

Mode of transportationValue (percent) Tons (percent) Ton�miles (percent)

2002 1997 2002 1997 2002 1997

Total –�� – – – – –

Single modes 1.7�� 1.1 2.6 .4 1.5 2.0

Truck 2.7�� 1.5 4.6 2.5 6.7 4.7For�hire truck 2.2�� 1.7 4.9 2.4 4.8 3.0Private truck 3.0�� 2.5 5.6 2.6 3.3 2.8

Rail 1.6�� .6 5.1 2.1 S 3.2

Water .2�� .3 .9 .8 4.2 4.1Shallow draft .2�� .3 .9 .8 4.2 4.1Great Lakes –�� – – – – –Deep draft –�� – – – – –

Air (includes truck and air) S�� .1 S – S –Pipeline S�� S S S S S

Multiple modes 1.4�� 1.0 .3 .5 1.0 S

Parcel, U.S. Postal Service or courier 1.1�� .9 – – .1 –Truck and rail S�� .2 – – .1 .4Truck and water –�� S S S – SRail and water S�� S S S S SOther multiple modes S�� S S S S S

Other and unknown modes .8�� .5 S .1 S .3



B–4 Appendix B Iowa Transportation�Commodity Flow SurveyBureau of Transportation Statistics and U.S. Census Bureau, 2002 Economic Census

Table B–2. Estimated Measures of Reliability for Shipment Characteristics by Total ModalActivity for State of Origin: 2002



Ton�miles





Total 39.2�� – 15.7

Truck 12.5�� 6.7 24.2Rail S�� S 4.1Shallow draft 19.1�� 4.2 11.1Great Lakes –�� – –Deep draft –�� – –

Air S�� S 8.4Parcel, U.S. Postal Service or courier S�� S 31.4Pipeline S�� S SOther and unknown modes S�� S S


Note: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsamplingerror, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.

Transportation�Commodity Flow Survey Iowa Appendix B B–5Bureau of Transportation Statistics and U.S. Census Bureau, 2002 Economic Census

Table B–3. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation and Distance Shipped for State of Origin: 2002


Mode of transportation and distance shipped(based on Great Circle Distance)


Coefficient ofvariation of number

Standard error ofpercentage





Total 5.9�� – 13.6 – 39.2 –

Less than 50 miles 12.4�� 1.7 15.6 4.8 15.0 .650 to 99 miles 11.6�� .6 27.4 2.1 25.8 .7100 to 249 miles 7.4�� 1.0 11.7 1.2 11.6 1.0250 to 499 miles 10.3�� 1.3 21.8 2.0 22.4 2.6500 to 749 miles 6.1�� .8 24.7 1.3 20.8 3.8

750 to 999 miles 4.9�� .8 9.5 2.2 9.9 6.11,000 to 1,499 miles 20.2�� 1.5 S S S S1,500 to 1,999 miles 17.9�� .5 24.4 .2 24.8 1.32,000 miles or more 49.7�� – 44.5 – 48.7 –

Single modes 6.7�� – 13.9 – 40.4 –

Less than 50 miles 11.8�� 1.7 12.7 4.4 14.8 .550 to 99 miles 12.0�� .6 29.2 2.1 27.2 .7100 to 249 miles 7.3�� .9 12.0 1.2 11.9 1.2250 to 499 miles 11.6�� 1.3 22.1 2.0 22.6 2.8500 to 749 miles 6.5�� .8 24.9 1.3 20.8 3.8

750 to 999 miles 7.0�� .9 8.6 2.0 8.8 6.11,000 to 1,499 miles 22.5�� 1.6 S S S S1,500 to 1,999 miles 17.4�� .4 25.5 .3 25.9 1.32,000 miles or more S�� S S S S S

Truck 7.1�� – 11.7 – 12.5 –

Less than 50 miles 12.0�� 1.7 12.8 3.9 14.8 1.150 to 99 miles 11.8�� .6 29.1 2.6 27.2 1.5100 to 249 miles 7.7�� .9 13.0 1.8 12.9 1.8250 to 499 miles 12.9�� 1.4 26.4 2.2 27.4 3.2500 to 749 miles 6.8�� 1.2 40.6 1.5 35.9 4.8

750 to 999 miles 11.3�� .9 14.0 .3 14.2 1.71,000 to 1,499 miles 12.0�� .8 23.3 .3 21.9 2.11,500 to 1,999 miles 19.9�� .4 25.1 .1 25.4 1.02,000 miles or more S�� S S S S S

For�hire truck 8.3�� – 21.0 – 12.0 –

Less than 50 miles 16.7�� 1.3 34.0 5.9 26.1 .750 to 99 miles 13.7�� .6 33.5 1.7 33.8 1.3100 to 249 miles 5.7�� 1.3 14.7 2.7 14.2 1.4250 to 499 miles 13.9�� 1.3 22.7 2.6 23.4 3.4500 to 749 miles 10.9�� 1.6 14.0 1.3 13.8 2.2

750 to 999 miles 12.1�� 1.5 16.2 1.1 16.4 2.01,000 to 1,499 miles 12.6�� .9 24.9 .8 23.4 2.51,500 to 1,999 miles 20.0�� .5 17.3 .2 17.4 .82,000 miles or more S�� S S S S S

Private truck 11.4�� – 17.0 – 24.6 –

Less than 50 miles 17.3�� 3.8 18.6 7.1 24.4 4.550 to 99 miles 15.4�� 1.9 48.7 3.4 44.9 3.2100 to 249 miles 11.4�� 2.0 19.4 2.0 18.9 4.4250 to 499 miles 25.6�� 2.3 38.6 2.2 40.4 4.0500 to 749 miles 31.7�� 1.7 S S S S

750 to 999 miles 29.3�� 1.0 44.1 .3 45.0 1.51,000 to 1,499 miles 39.4�� .3 39.3 – 43.3 1.91,500 to 1,999 miles 34.3�� .3 S S S S2,000 miles or more –�� – – – – –

Rail 23.5�� – 49.2 – S S

Less than 50 miles S�� S 47.1 .9 S S50 to 99 miles 36.2�� .4 S S S S100 to 249 miles 19.1�� 4.1 22.3 2.2 21.8 .9250 to 499 miles 23.7�� 3.4 29.5 5.2 31.8 4.1500 to 749 miles 18.6�� 1.9 16.2 3.6 16.9 4.3

750 to 999 miles 32.7�� 5.1 30.4 6.2 32.9 8.51,000 to 1,499 miles S�� S S S S S1,500 to 1,999 miles 33.7�� 1.4 40.0 1.4 39.8 3.22,000 miles or more –�� – – – – –

Water 16.8�� – 18.7 – 19.1 –


750 to 999 miles 17.4�� 5.7 15.8 5.9 15.8 5.31,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –

Shallow draft 16.8�� – 18.7 – 19.1 –


750 to 999 miles 17.4�� 5.7 15.8 5.9 15.8 5.31,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –



Table B–3. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation and Distance Shipped for State of Origin: 2002�Con.










Single modes�Con.

Great Lakes –�� – – – – –



Deep draft –�� – – – – –



Air (includes truck and air) S�� S S S S S

Less than 50 miles –�� – – – – –50 to 99 miles S�� S S S S S100 to 249 miles S�� S S S S S250 to 499 miles S�� S S S S S500 to 749 miles S�� S 46.6 4.3 49.1 4.0

750 to 999 miles S�� S S S S S1,000 to 1,499 miles S�� S S S S S1,500 to 1,999 miles S�� S S S S S2,000 miles or more S�� S S S S S

Pipeline S�� S S S S S

Less than 50 miles S�� S S S S S50 to 99 miles S�� S S S S S100 to 249 miles S�� S S S S S250 to 499 miles S�� S S S S S500 to 749 miles –�� – – – S S

750 to 999 miles –�� – – – S S1,000 to 1,499 miles –�� – – – S S1,500 to 1,999 miles –�� – – – S S2,000 miles or more –�� – – – S S

Multiple modes 18.3�� – 35.7 – 40.0 –

Less than 50 miles 29.0�� 1.1 S S S S50 to 99 miles 23.5�� 1.0 31.7 .8 S S100 to 249 miles 23.8�� 2.9 38.7 2.7 36.3 .7250 to 499 miles 21.7�� 2.7 24.4 4.3 25.1 2.2500 to 749 miles 21.9�� 1.3 16.9 2.7 17.5 2.3

750 to 999 miles 23.6�� 2.4 S S S S1,000 to 1,499 miles 26.7�� 2.2 32.5 3.0 31.0 4.71,500 to 1,999 miles 42.9�� 2.8 43.9 2.8 45.5 5.72,000 miles or more S�� S 48.8 1.3 S S

Parcel, U.S. Postal Service or courier 15.5�� – 16.6 – 21.2 –

Less than 50 miles 31.0�� 1.2 38.2 1.1 43.5 –50 to 99 miles 23.6�� 1.1 19.8 .8 20.2 .1100 to 249 miles 18.4�� 3.4 49.2 6.1 42.4 3.0250 to 499 miles 19.7�� 2.7 20.0 2.8 20.8 1.9500 to 749 miles 22.8�� 1.4 19.9 2.0 19.7 1.9

750 to 999 miles 18.0�� 1.8 21.9 2.2 21.3 2.81,000 to 1,499 miles 31.4�� 2.7 30.1 2.7 31.8 3.61,500 to 1,999 miles 25.4�� 1.3 21.3 .4 20.9 .72,000 miles or more S�� S S S S S

Truck and rail S�� S 41.0 – 41.5 –

Less than 50 miles –�� – – – – –50 to 99 miles S�� S S S S S100 to 249 miles S�� S S S S S250 to 499 miles S�� S S S S S500 to 749 miles 37.7�� 2.8 44.3 4.0 44.4 2.8

750 to 999 miles S�� S S S S S1,000 to 1,499 miles S�� S S S S S1,500 to 1,999 miles S�� S S S S S2,000 miles or more –�� – – – – –

Truck and water 45.2�� – S S 48.7 –


750 to 999 miles S�� S S S S S1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles S�� S S S S S2,000 miles or more S�� S S S S S



Table B–3. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation and Distance Shipped for State of Origin: 2002�Con.











Rail and water S�� S S S S S


750 to 999 miles S�� S S S S S1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles –�� – – – – –2,000 miles or more –�� – – – – –

Other multiple modes S�� S S S S S

Less than 50 miles S�� S S S S S50 to 99 miles –�� – – – – –100 to 249 miles –�� – – – – –250 to 499 miles –�� – – – – –500 to 749 miles –�� – – – – –

750 to 999 miles S�� S S S S S1,000 to 1,499 miles –�� – – – – –1,500 to 1,999 miles S�� S S S S S2,000 miles or more –�� – – – – –

Other and unknown modes 33.4�� – S S S S

Less than 50 miles 43.8�� 11.6 S S S S50 to 99 miles 44.4�� 1.5 49.9 5.7 49.4 4.3100 to 249 miles S�� S 40.8 4.8 35.0 6.5250 to 499 miles S�� S S S S S500 to 749 miles 39.9�� 7.5 S S S S

750 to 999 miles S�� S S S S S1,000 to 1,499 miles 45.2�� 4.4 S S S S1,500 to 1,999 miles S�� S S S S S2,000 miles or more –�� – – – – –




Table B–4. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation and Shipment Weight for State of Origin: 2002












Total 5.9�� – 13.6 – 39.2 – 15.7

Less than 50 lb 26.2�� 1.6 20.9 – 15.8 – 21.850 to 99 lb 13.7�� .3 20.4 – 16.0 – 23.9100 to 499 lb 13.7�� .8 18.9 .2 14.3 – 26.3500 to 749 lb 11.2�� .2 12.4 – 12.4 – 20.4750 to 999 lb 14.3�� .2 22.6 – 15.2 – 20.0

1,000 to 9,999 lb 7.0�� .8 22.7 1.0 9.4 .5 17.710,000 to 49,999 lb 8.9�� 2.4 8.6 4.1 13.0 5.2 8.050,000 to 99,999 lb 13.1�� .8 21.0 4.0 14.5 1.0 28.7100,000 lb or more 17.8�� 1.2 33.2 4.3 S S 12.3

Single modes 6.7�� – 13.9 – 40.4 – 25.2

Less than 50 lb 44.9�� 1.4 36.6 – 16.8 – S50 to 99 lb 21.6�� .3 26.1 – 15.5 – 35.5100 to 499 lb 13.5�� .7 19.3 .1 15.2 – 26.4500 to 749 lb 11.9�� .2 12.7 – 12.8 – 21.2750 to 999 lb 14.6�� .2 23.2 – 15.9 – 21.0

1,000 to 9,999 lb 7.0�� .7 22.3 1.0 9.5 .5 18.710,000 to 49,999 lb 9.2�� 2.6 9.0 4.1 13.4 5.8 8.350,000 to 99,999 lb 14.0�� .8 22.6 4.2 15.3 1.1 28.2100,000 lb or more 19.5�� 1.4 37.7 4.5 S S 6.4

Truck2 7.1�� – 11.7 – 12.5 – 24.2

Less than 50 lb 32.0�� .9 37.5 – 25.5 – S50 to 99 lb 24.8�� .4 26.5 – 16.3 – 32.1100 to 499 lb 14.1�� .8 19.7 .2 12.1 .1 23.9500 to 749 lb 12.8�� .3 13.1 – 10.6 – 20.2750 to 999 lb 14.4�� .2 23.3 – 16.0 – 22.4

1,000 to 9,999 lb 6.4�� .7 22.5 1.2 9.3 .7 20.410,000 to 49,999 lb 9.1�� 1.7 8.9 4.4 13.1 2.7 8.250,000 to 99,999 lb 17.7�� 1.0 22.8 4.9 17.5 2.1 22.7100,000 lb or more 32.7�� .3 40.7 .7 S S 40.5

For�hire truck 8.3�� – 21.0 – 12.0 – 9.9

Less than 50 lb 32.4�� .1 16.6 – 19.7 – 10.150 to 99 lb 24.3�� .1 16.3 – 16.0 – 6.1100 to 499 lb 14.8�� .5 16.3 – 17.6 .1 7.5500 to 749 lb 10.2�� .2 11.0 – 15.6 – 8.5750 to 999 lb 20.9�� .2 14.3 – 19.7 – 8.4

1,000 to 9,999 lb 10.2�� 1.2 14.3 .7 12.1 .8 7.010,000 to 49,999 lb 9.5�� 1.1 14.8 4.3 13.8 2.3 7.750,000 to 99,999 lb 22.9�� 1.6 34.3 5.5 19.6 2.1 29.4100,000 lb or more 34.5�� .4 37.5 1.0 39.4 1.4 19.6

Private truck 11.4�� – 17.0 – 24.6 – 17.2

Less than 50 lb 38.0�� 2.1 39.3 – 34.6 – 23.250 to 99 lb 33.7�� .8 29.6 – 26.0 .1 36.5100 to 499 lb 24.7�� 1.4 27.5 .3 26.6 .4 13.5500 to 749 lb 19.7�� .4 18.3 – 20.0 .2 17.7750 to 999 lb 15.2�� .4 31.0 .1 14.4 – 31.5

1,000 to 9,999 lb 9.0�� 2.7 32.7 1.6 9.7 1.9 19.910,000 to 49,999 lb 18.7�� 4.9 14.3 5.3 28.6 4.6 25.950,000 to 99,999 lb 38.8�� 2.8 41.5 6.4 41.9 5.2 18.3100,000 lb or more S�� S S S S S 27.9

Rail 23.5�� – 49.2 – S S 4.1

Less than 50 lb –�� – – – – – –50 to 99 lb S�� S S S S S 31.6100 to 499 lb S�� S S S S S 30.7500 to 749 lb –�� – – – – – –750 to 999 lb –�� – – – – – –

1,000 to 9,999 lb S�� S S S S S 30.610,000 to 49,999 lb 28.2�� 4.0 48.2 1.2 S S 13.050,000 to 99,999 lb S�� S 48.3 .4 S S 31.2100,000 lb or more 25.4�� 5.6 49.6 1.2 S S 3.2

Water 16.8�� – 18.7 – 19.1 – 11.1


1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb S�� S S S S S 31.6100,000 lb or more 17.0�� 3.7 18.7 – 19.1 – 11.2

Shallow draft 16.8�� – 18.7 – 19.1 – 11.1


1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb S�� S S S S S 31.6100,000 lb or more 17.0�� 3.7 18.7 – 19.1 – 11.2

See footnote at end of table.


Table B–4. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation and Shipment Weight for State of Origin: 2002�Con.












Single modes�Con.

Great Lakes –�� – – – – – –



Deep draft –�� – – – – – –



Air (includes truck and air) S�� S S S S S 8.4

Less than 50 lb S�� S 27.9 9.6 23.8 10.1 8.950 to 99 lb S�� S 41.2 3.4 32.6 4.3 12.4100 to 499 lb S�� S S S S S 8.5500 to 749 lb S�� S S S S S 28.3750 to 999 lb S�� S S S S S 26.7

1,000 to 9,999 lb S�� S S S S S 28.210,000 to 49,999 lb S�� S S S S S 31.650,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –

Pipeline3 S�� S S S S S S

Less than 50 lb –�� – – – S S S50 to 99 lb –�� – – – S S S100 to 499 lb S�� S S S S S S500 to 749 lb –�� – – – S S S750 to 999 lb S�� S S S S S S

1,000 to 9,999 lb S�� S S S S S S10,000 to 49,999 lb S�� S S S S S S50,000 to 99,999 lb –�� – – – S S S100,000 lb or more –�� – – – S S S

Multiple modes 18.3�� – 35.7 – 40.0 – 6.9

Less than 50 lb 18.6�� 2.1 13.4 5.6 17.8 4.8 7.250 to 99 lb 18.3�� 2.1 17.9 2.7 22.0 2.3 6.2100 to 499 lb 19.9�� 3.6 25.0 6.2 29.8 6.1 10.2500 to 749 lb 26.7�� .3 26.9 .5 33.9 .5 18.8750 to 999 lb 40.4�� .1 42.3 .4 S S 14.0

1,000 to 9,999 lb 32.5�� – 40.1 .2 43.2 .3 25.310,000 to 49,999 lb 49.7�� 4.9 41.9 7.5 40.4 9.6 25.950,000 to 99,999 lb S�� S S S S S 30.0100,000 lb or more S�� S S S S S 25.5

Parcel, U.S. Postal Service or courier 15.5�� – 16.6 – 21.2 – 6.9

Less than 50 lb 18.6�� 4.5 13.4 3.4 17.8 4.4 7.250 to 99 lb 18.3�� 1.9 17.9 1.7 22.0 1.2 6.2100 to 499 lb 19.9�� 3.3 25.0 4.4 29.9 4.2 10.2500 to 749 lb 26.7�� .4 26.9 1.1 33.9 1.1 18.8750 to 999 lb 39.1�� .1 41.9 .7 45.2 .6 13.3

1,000 to 9,999 lb S�� S S S S S 31.610,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –

Truck and rail S�� S 41.0 – 41.5 – 14.3

Less than 50 lb S�� S S S S S 31.650 to 99 lb –�� – – – – – –100 to 499 lb S�� S S S S S 31.6500 to 749 lb –�� – – – – – –750 to 999 lb –�� – – – – – –

1,000 to 9,999 lb 35.3�� 2.8 45.5 2.1 34.7 2.2 24.910,000 to 49,999 lb S�� S 48.0 8.4 47.8 7.6 14.550,000 to 99,999 lb S�� S S S S S 30.0100,000 lb or more S�� S S S S S 29.5

Truck and water 45.2�� – S S 48.7 – 34.6

Less than 50 lb S�� S S S S S 31.650 to 99 lb –�� – – – – – –100 to 499 lb S�� S S S S S 31.6500 to 749 lb –�� – – – – – –750 to 999 lb S�� S S S S S 31.6

1,000 to 9,999 lb S�� S S S S S 30.410,000 to 49,999 lb 48.3�� 14.2 S S 49.6 14.3 39.350,000 to 99,999 lb –�� – – – – – –100,000 lb or more –�� – – – – – –



Table B–4. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation and Shipment Weight for State of Origin: 2002�Con.













Rail and water S�� S S S S S 27.9


1,000 to 9,999 lb –�� – – – – – –10,000 to 49,999 lb –�� – – – – – –50,000 to 99,999 lb –�� – – – – – –100,000 lb or more S�� S S S S S 27.9

Other multiple modes S�� S S S S S 29.8


1,000 to 9,999 lb S�� S S S S S 31.610,000 to 49,999 lb S�� S S S S S 31.650,000 to 99,999 lb –�� – – – – – –100,000 lb or more S�� S S S S S 31.6

Other and unknown modes 33.4�� – S S S S S

Less than 50 lb S�� S S S 42.9 – S50 to 99 lb S�� S S S S S S100 to 499 lb S�� S S S S S S500 to 749 lb S�� S 37.3 .3 S S 36.6750 to 999 lb S�� S S S S S S

1,000 to 9,999 lb 29.3�� 10.7 41.8 12.9 37.1 16.2 43.610,000 to 49,999 lb 45.2�� 10.0 44.0 13.1 46.0 13.9 S50,000 to 99,999 lb S�� S S S S S 39.1100,000 lb or more S�� S S S S S 31.6




Table B–5a. Estimated Measures of Reliability for Shipment Characteristics by Two�DigitCommodity for State of Origin: 2002












Total 5.9�� – 13.6 – 39.2 – 15.7

01 Live animals and live fish S�� S S S S S 31.602 Cereal grains 47.4�� 1.5 46.0 5.9 S S S03 Other agricultural products 22.5�� .5 28.1 2.2 30.3 4.2 26.804 Animal feed and products of animal origin, n.e.c. 19.0�� .8 27.9 2.6 20.2 1.8 S05 Meat, fish, seafood, and their preparations 44.6�� 2.3 48.6 .5 S S 14.0

06 Milled grain products and preparations, and bakery products 19.2�� .4 22.2 .5 30.7 .9 16.407 Other prepared foodstuffs and fats and oils 31.9�� 3.1 32.8 4.1 28.4 4.3 19.408 Alcoholic beverages 25.6�� .4 25.6 .4 36.1 1.1 29.709 Tobacco products –�� – – – – – –10 Monumental or building stone –�� – – – – – –

11 Natural sands S�� S S S S S S12 Gravel and crushed stone 20.5�� – 29.9 5.3 S S 20.113 Nonmetallic minerals n.e.c. S�� S S S S S S14 Metallic ores and concentrates S�� S S S S S 31.615 Coal S�� S S S S S 27.9

17 Gasoline and aviation turbine fuel S�� S 46.1 .9 S S 26.118 Fuel oils 38.4�� .2 39.1 .9 S S 46.719 Coal and petroleum products, n.e.c. 43.4�� .7 45.0 1.0 46.7 .7 S20 Basic chemicals 35.5�� .1 S S S S S21 Pharmaceutical products 26.1�� .4 32.5 – 31.6 – 24.7

22 Fertilizers 38.4�� .5 39.8 1.7 S S 47.723 Chemical products and preparations, n.e.c. 37.2�� 1.9 35.2 .2 42.8 .5 31.724 Plastics and rubber 22.8�� 1.2 28.5 .4 28.8 .9 27.625 Logs and other wood in the rough S�� S S S S S 31.626 Wood products 27.3�� .4 36.3 .2 31.0 .2 31.9

27 Pulp, newsprint, paper, and paperboard 41.8�� .2 41.6 .1 41.0 .1 S28 Paper or paperboard articles S�� S S S S S S29 Printed products 30.1�� .3 S S S S 12.230 Textiles, leather, and articles of textiles or leather 39.7�� .8 S S S S 6.731 Nonmetallic mineral products 28.8�� .2 32.4 .8 27.2 .4 47.6

32 Base metal in primary or semifinished forms and in finished basicshapes 20.0�� .5 20.2 .3 28.2 .7 16.8

33 Articles of base metal 16.9�� .3 23.9 .1 28.7 .3 25.134 Machinery 14.0�� 2.3 24.6 .5 15.6 .6 21.235 Electronic and other electrical equipment and components and office

equipment 24.6�� .5 21.1 – 29.0 – 15.236 Motorized and other vehicles (including parts) 16.7�� 2.0 26.8 .2 29.7 .7 13.0

37 Transportation equipment, n.e.c. 42.0�� – 41.8 – 43.7 – 25.838 Precision instruments and apparatus S�� S 38.7 – 44.9 – 33.739 Furniture, mattresses and mattress supports, lamps, lighting fittings, and

illuminated signs 11.5�� .2 18.8 – 21.5 .2 9.340 Miscellaneous manufactured products 30.1�� 1.4 22.1 .1 28.4 .2 43.641 Waste and scrap S�� S S S S S S43 Mixed freight 10.5�� .7 9.4 .2 14.4 .2 S�� Commodity unknown 40.1�� – 40.1 – S S 27.0




Table B–5b. Estimated Standard Errors for Shipment Characteristics by Two�Digit Commodityfor State of Origin: Percent of Total for 2002 and 1997



Value (percent) Tons (percent) Ton�miles1 (percent)

2002 1997 2002 1997 2002 1997

Total –�� – – – – –

01 Live animals and live fish S�� .3 S .2 S –02 Cereal grains 1.5�� .5 5.9 2.5 S 4.503 Other agricultural products .5�� 2.2 2.2 1.9 4.2 1.404 Animal feed and products of animal origin, n.e.c .8�� .8 2.6 1.6 1.8 1.805 Meat, fish, seafood, and their preparations 2.3�� .9 .5 .3 S .7

06 Milled grain products and preparations, and bakery products .4�� 1.7 .5 .5 .9 1.207 Other prepared foodstuffs and fats and oils 3.1�� .6 4.1 .7 4.3 1.708 Alcoholic beverages .4�� .5 .4 .3 1.1 .709 Tobacco products –�� – – – – –10 Monumental or building stone –�� S – S – S

11 Natural sands S�� – S 1.9 S S12 Gravel and crushed stone –�� – 5.3 2.9 S 2.513 Nonmetallic minerals n.e.c. S�� S S .7 S .214 Metallic ores and concentrates S�� S S S S S15 Coal S�� S S S S S

17 Gasoline and aviation turbine fuel S�� .4 .9 1.1 S .218 Fuel oils .2�� .2 .9 .3 S S19 Coal and petroleum products, n.e.c. .7�� .2 1.0 .4 .7 .220 Basic chemicals .1�� .2 S .1 S –21 Pharmaceutical products .4�� .4 – – – –

22 Fertilizers .5�� .2 1.7 .5 S .223 Chemical products and preparations, n.e.c. 1.9�� 1.1 .2 .2 .5 .724 Plastics and rubber 1.2�� .7 .4 .3 .9 .625 Logs and other wood in the rough S�� S S S S S26 Wood products .4�� .2 .2 .1 .2 –

27 Pulp, newsprint, paper, and paperboard .2�� .2 .1 .2 .1 .328 Paper or paperboard articles S�� .2 S .1 S –29 Printed products .3�� .2 S – S –30 Textiles, leather, and articles of textiles or leather .8�� .2 S – S –31 Nonmetallic mineral products .2�� .1 .8 .8 .4 .3

32 Base metal in primary or semifinished forms and in finished basicshapes .5�� 1.0 .3 .5 .7 .5

33 Articles of base metal .3�� .5 .1 .2 .3 .434 Machinery 2.3�� 1.0 .5 .1 .6 .435 Electronic and other electrical equipment and components and office

equipment .5�� .6 – – – –36 Motorized and other vehicles (including parts) 2.0�� 2.5 .2 .1 .7 .5

37 Transportation equipment, n.e.c. –�� .1 – – – –38 Precision instruments and apparatus S�� .1 – – – –39 Furniture, mattresses and mattress supports, lamps, lighting fittings, and

illuminated signs .2�� .2 – – .2 .140 Miscellaneous manufactured products 1.4�� .4 .1 – .2 –41 Waste and scrap S�� – S .2 S .143 Mixed freight .7�� S .2 S .2 S�� Commodity unknown –�� .3 – S S S




Table B–6. Estimated Measures of Reliability for Shipment Characteristics by Two�DigitCommodity and Mode of Transportation for State of Origin: 2002












ALL COMMODITIES

Total 5.9�� – 13.6 – 39.2 – 15.7

Single modes 6.7�� 1.7 13.9 2.6 40.4 1.5 25.2


Rail 23.5�� 1.6 49.2 5.1 S S 4.1

Water 16.8�� .2 18.7 .9 19.1 4.2 11.1Shallow draft 16.8�� .2 18.7 .9 19.1 4.2 11.1Great Lakes –�� – – – – – –Deep draft –�� – – – – – –


Multiple modes 18.3�� 1.4 35.7 .3 40.0 1.0 6.9

Parcel, U.S. Postal Service or courier 15.5�� 1.1 16.6 – 21.2 .1 6.9Truck and rail S�� S 41.0 – 41.5 .1 14.3Truck and water 45.2�� – S S 48.7 – 34.6Rail and water S�� S S S S S 27.9Other multiple modes S�� S S S S S 29.8

Other and unknown modes 33.4�� .8 S S S S S

SCTG 01, LIVE ANIMALS AND LIVE FISH

Total S�� S S S S S 31.6

Single modes S�� S S S S S 31.6

Truck S�� S S S S S 31.6For�hire truck S�� S S S S S 31.6Private truck S�� S S S S S 31.6

Rail –�� – – – – – –


Air (includes truck and air) –�� – – – – – –Pipeline –�� – – – S S S




SCTG 02, CEREAL GRAINS

Total 47.4�� – 46.0 – S S S

Single modes S�� S 49.0 6.7 S S S

Truck 44.2�� 9.5 S S 44.3 2.6 SFor�hire truck S�� S S S S S SPrivate truck 43.5�� 8.3 46.9 8.8 S S 48.6

Rail S�� S S S S S 24.2

Water 26.8�� 12.0 25.0 12.6 25.9 15.5 12.7Shallow draft 26.8�� 12.0 25.0 12.6 25.9 15.5 12.7Great Lakes –�� – – – – – –Deep draft –�� – – – – – –

Air (includes truck and air) S�� S S S S S 32.0Pipeline –�� – – – S S S

Multiple modes S�� S S S S S 26.5

Parcel, U.S. Postal Service or courier S�� S S S S S 28.1Truck and rail S�� S S S S S 31.6Truck and water –�� – – – – – –Rail and water S�� S S S S S 29.8Other multiple modes –�� – – – – – –




Table B–6. Estimated Measures of Reliability for Shipment Characteristics by Two�DigitCommodity and Mode of Transportation for State of Origin: 2002�Con.












SCTG 03, OTHER AGRICULTURAL PRODUCTS

Total 22.5�� – 28.1 – 30.3 – 26.8

Single modes 26.9�� 8.6 28.4 1.2 30.5 1.0 S

Truck 39.7�� 12.3 42.9 13.2 45.0 2.7 26.5For�hire truck S�� S S S S S SPrivate truck S�� S S S 49.1 2.6 24.2


Water 27.9�� 11.7 31.1 12.7 30.4 12.3 14.9Shallow draft 27.9�� 11.7 31.1 12.7 30.4 12.3 14.9Great Lakes –�� – – – – – –Deep draft –�� – – – – – –



Parcel, U.S. Postal Service or courier S�� S S S S S 24.7Truck and rail S�� S S S S S 30.6Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes S�� S S S S S 37.6

SCTG 04, ANIMAL FEED AND PRODUCTS OF ANIMAL ORIGIN,N.E.C.

Total 19.0�� – 27.9 – 20.2 – S

Single modes 19.1�� 2.1 29.1 2.6 20.2 7.2 S

Truck 21.3�� 5.6 34.9 6.0 41.1 7.7 SFor�hire truck 14.7�� 8.9 9.8 7.9 28.5 5.6 14.1Private truck 33.2�� 11.1 49.8 12.0 S S S

Rail 12.5�� 5.7 12.1 6.0 13.5 9.5 3.2




Parcel, U.S. Postal Service or courier S�� S 44.3 – 48.7 – 24.0Truck and rail S�� S S S S S 31.6Truck and water –�� – – – – – –Rail and water S�� S S S S S 31.6Other multiple modes S�� S S S S S 31.6


SCTG 05, MEAT, FISH, SEAFOOD, AND THEIR PREPARATIONS

Total 44.6�� – 48.6 – S S 14.0

Single modes 43.4�� .8 48.1 .4 S S 13.8

Truck 43.6�� .8 48.3 .5 S S 13.8For�hire truck 43.0�� 4.9 43.9 4.5 S S 9.1Private truck 49.8�� 5.1 S S S S S





Parcel, U.S. Postal Service or courier S�� S S S S S STruck and rail S�� S S S S S 31.6Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –
















SCTG 06, MILLED GRAIN PRODUCTS AND PREPARATIONS,AND BAKERY PRODUCTS

Total 19.2�� – 22.2 – 30.7 – 16.4

Single modes 19.2�� – 22.2 – 30.7 – 16.4

Truck 19.8�� 5.3 22.2 6.8 33.4 9.8 19.0For�hire truck 20.3�� 6.2 23.0 6.4 33.9 9.6 14.3Private truck 23.9�� 1.3 28.8 1.3 S S 36.2

Rail 29.8�� 5.3 28.0 6.8 30.9 9.8 19.3






SCTG 07, OTHER PREPARED FOODSTUFFS AND FATS ANDOILS

Total 31.9�� – 32.8 – 28.4 – 19.4

Single modes 33.3�� 3.2 31.1 4.7 28.6 1.0 16.4

Truck 38.6�� 5.9 42.0 4.8 S S 21.1For�hire truck 34.5�� 6.1 35.8 4.6 32.0 3.8 13.0Private truck S�� S S S S S 31.0

Rail 15.3�� 6.2 16.9 7.1 16.2 6.6 2.1




Parcel, U.S. Postal Service or courier S�� S S S S S 26.7Truck and rail S�� S S S S S 31.6Truck and water S�� S S S S S 31.6Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 08, ALCOHOLIC BEVERAGES

Total 25.6�� – 25.6 – 36.1 – 29.7

Single modes 25.6�� – 25.6 – 36.1 – 29.7

Truck 26.8�� 12.9 23.5 13.8 30.3 19.5 19.6For�hire truck 33.4�� 3.3 33.0 5.1 33.8 1.9 22.5Private truck 37.5�� 15.8 38.8 18.2 S S 11.4

Rail 37.6�� 12.9 30.2 13.8 37.4 19.5 24.0




















SCTG 09, TOBACCO PRODUCTS

Total –�� – – – – – –

Single modes –�� – – – – – –

Truck –�� – – – – – –For�hire truck –�� – – – – – –Private truck –�� – – – – – –

Rail –�� – – – – – –






SCTG 10, MONUMENTAL OR BUILDING STONE

Total –�� – – – – – –

Single modes –�� – – – – – –

Truck –�� – – – – – –For�hire truck –�� – – – – – –Private truck –�� – – – – – –

Rail –�� – – – – – –






SCTG 11, NATURAL SANDS



Truck S�� S S S S S SFor�hire truck S�� S S S S S 31.6Private truck S�� S S S S S S

Rail –�� – – – – – –




















SCTG 12, GRAVEL AND CRUSHED STONE

Total 20.5�� – 29.9 – S S 20.1

Single modes 20.9�� 1.5 30.4 1.8 S S 20.2

Truck 21.4�� 2.0 30.6 1.9 S S 20.2For�hire truck 44.8�� 10.1 S S 39.7 8.7 SPrivate truck 20.7�� 9.4 21.2 10.4 S S S







SCTG 13, NONMETALLIC MINERALS N.E.C.



Truck S�� S S S S S 23.1For�hire truck S�� S S S S S 30.4Private truck 41.0�� 13.7 S S S S S





Parcel, U.S. Postal Service or courier S�� S S S S S 31.6Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 43.4�� 12.2 48.7 11.3 S S S

SCTG 14, METALLIC ORES AND CONCENTRATES



Truck S�� S S S S S 31.6For�hire truck –�� – – – – – –Private truck S�� S S S S S 31.6

Rail –�� – – – – – –




















SCTG 15, COAL




Rail –�� – – – – – –






SCTG 17, GASOLINE AND AVIATION TURBINE FUEL

Total S�� S 46.1 – S S 26.1

Single modes S�� S 47.4 2.4 S S 30.5

Truck S�� S 47.4 2.4 S S 30.5For�hire truck S�� S 47.8 3.0 S S 27.8Private truck S�� S S S S S 33.0

Rail –�� – – – – – –






SCTG 18, FUEL OILS

Total 38.4�� – 39.1 – S S 46.7

Single modes 38.4�� .1 39.1 – S S 46.3

Truck 38.4�� .1 39.1 – S S 46.3For�hire truck S�� S S S S S 15.8Private truck S�� S S S S S S

Rail –�� – – – – – –




















SCTG 19, COAL AND PETROLEUM PRODUCTS, N.E.C.

Total 43.4�� – 45.0 – 46.7 – S

Single modes 43.5�� 11.6 45.1 11.0 46.7 10.6 S

Truck 41.6�� 10.6 45.7 10.4 47.0 10.1 SFor�hire truck S�� S S S S S SPrivate truck S�� S 49.8 14.1 S S S

Rail –�� – – – – – –




Parcel, U.S. Postal Service or courier S�� S S S S S 37.0Truck and rail –�� – – – – – –Truck and water S�� S S S S S 31.6Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 20, BASIC CHEMICALS

Total 35.5�� – S S S S S

Single modes 36.1�� 1.2 S S S S S

Truck 36.8�� 1.8 S S S S 45.9For�hire truck 29.7�� 7.5 S S S S 26.4Private truck S�� S S S S S 33.7




Multiple modes 39.1�� .9 45.0 .5 42.1 1.0 23.2

Parcel, U.S. Postal Service or courier S�� S S S S S 29.4Truck and rail 41.4�� 1.0 45.6 .5 42.8 1.0 26.6Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 21, PHARMACEUTICAL PRODUCTS

Total 26.1�� – 32.5 – 31.6 – 24.7

Single modes 30.0�� 13.0 32.9 11.8 33.5 12.9 38.8

Truck 31.5�� 14.0 36.7 13.0 40.1 14.1 31.4For�hire truck 33.7�� 12.3 41.5 14.0 46.5 14.8 20.2Private truck 43.8�� 9.2 S S S S 25.2




Multiple modes 47.4�� 10.6 S S S S 22.5

Parcel, U.S. Postal Service or courier 47.4�� 10.6 S S S S 22.5Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –
















SCTG 22, FERTILIZERS

Total 38.4�� – 39.8 – S S 47.7

Single modes 38.4�� – 39.8 – S S 47.6

Truck 39.2�� 3.7 39.4 4.1 44.1 15.2 SFor�hire truck S�� S S S S S 30.2Private truck 45.0�� 9.1 44.8 8.5 S S S







SCTG 23, CHEMICAL PRODUCTS AND PREPARATIONS, N.E.C.

Total 37.2�� – 35.2 – 42.8 – 31.7

Single modes 37.1�� 5.4 35.7 4.4 43.0 7.3 40.2

Truck 42.0�� 8.6 38.3 7.6 48.7 10.2 42.4For�hire truck S�� S 45.7 11.7 S S 12.4Private truck 31.6�� 15.2 32.1 15.6 35.6 11.4 S





Parcel, U.S. Postal Service or courier 43.3�� .1 41.6 – 47.2 – 16.1Truck and rail S�� S S S S S 26.7Truck and water S�� S S S S S 31.6Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 24, PLASTICS AND RUBBER

Total 22.8�� – 28.5 – 28.8 – 27.6

Single modes 25.4�� 3.3 29.4 1.6 30.3 2.9 S




Air (includes truck and air) 47.5�� – S S 47.8 – 22.6Pipeline –�� – – – S S S

Multiple modes 29.2�� 2.8 30.4 .9 31.3 1.6 12.4

Parcel, U.S. Postal Service or courier 29.2�� 2.7 32.3 .8 33.8 1.2 12.2Truck and rail S�� S S S S S 27.9Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes S�� S S S S S 31.6

Other and unknown modes 29.6�� .7 43.9 .9 S S S















SCTG 25, LOGS AND OTHER WOOD IN THE ROUGH




Rail –�� – – – – – –






SCTG 26, WOOD PRODUCTS

Total 27.3�� – 36.3 – 31.0 – 31.9

Single modes 27.5�� 1.1 36.4 .2 31.1 .2 30.0

Truck 27.5�� 1.1 36.4 .2 31.1 .2 30.3For�hire truck 23.6�� 9.4 35.9 9.6 40.6 7.9 14.8Private truck S�� S 42.7 9.6 36.6 7.9 S

Rail –�� – – – – – –


Air (includes truck and air) 35.5�� – 49.5 – S S 24.3Pipeline –�� – – – S S S




SCTG 27, PULP, NEWSPRINT, PAPER, AND PAPERBOARD

Total 41.8�� – 41.6 – 41.0 – S

Single modes 41.9�� .3 41.7 .3 41.0 – S

Truck 41.6�� 3.0 39.3 4.5 37.7 9.0 SFor�hire truck 44.5�� 9.2 41.8 6.4 38.2 8.3 20.3Private truck S�� S S S S S S





Parcel, U.S. Postal Service or courier S�� S S S S S 43.7Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes S�� S S S S S 31.6
















SCTG 28, PAPER OR PAPERBOARD ARTICLES



Truck S�� S S S S S SFor�hire truck S�� S S S S S SPrivate truck S�� S S S S S 25.7

Rail –�� – – – – – –






SCTG 29, PRINTED PRODUCTS

Total 30.1�� – S S S S 12.2

Single modes 47.9�� 12.7 S S S S 30.2

Truck 47.9�� 12.7 S S S S 30.2For�hire truck S�� S S S S S 18.9Private truck S�� S S S S S 33.8

Rail –�� – – – – – –



Multiple modes 43.9�� 12.7 S S S S 8.2

Parcel, U.S. Postal Service or courier 43.9�� 12.7 S S S S 8.2Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 43.2�� .4 S S S S 48.7

SCTG 30, TEXTILES, LEATHER, AND ARTICLES OF TEXTILESOR LEATHER

Total 39.7�� – S S S S 6.7

Single modes 42.4�� 8.9 S S S S 29.7

Truck 43.7�� 11.3 S S S S 34.4For�hire truck S�� S S S S S 18.9Private truck 46.2�� 16.0 40.3 15.4 48.3 13.7 S




Multiple modes 37.4�� 9.2 25.9 4.9 27.7 8.7 3.4

Parcel, U.S. Postal Service or courier 37.4�� 9.2 25.9 4.9 27.7 8.7 3.4Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –
















SCTG 31, NONMETALLIC MINERAL PRODUCTS

Total 28.8�� – 32.4 – 27.2 – 47.6

Single modes 29.2�� 10.5 32.4 10.5 27.2 10.5 25.8

Truck 31.7�� 10.6 36.1 10.5 27.0 10.5 27.5For�hire truck 29.3�� 10.8 S S 26.8 10.9 27.0Private truck S�� S S S S S 27.1

Rail 48.3�� 3.2 47.5 5.1 S S 26.7




Parcel, U.S. Postal Service or courier S�� S S S S S 25.6Truck and rail S�� S S S S S 31.6Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 32, BASE METAL IN PRIMARY OR SEMIFINISHED FORMSAND IN FINISHED BASIC SHAPES

Total 20.0�� – 20.2 – 28.2 – 16.8

Single modes 20.4�� 1.7 20.4 .8 28.2 .7 19.1


Rail 44.2�� 2.8 43.3 6.1 43.4 10.5 25.3





Other and unknown modes 35.0�� 1.0 42.0 .7 S S 27.0

SCTG 33, ARTICLES OF BASE METAL

Total 16.9�� – 23.9 – 28.7 – 25.1

Single modes 18.1�� 3.4 24.1 1.4 29.2 1.4 35.6

Truck 18.7�� 4.2 27.1 5.1 37.9 8.5 31.0For�hire truck 20.9�� 3.7 32.9 7.0 40.6 9.1 8.4Private truck 20.0�� 3.8 19.7 4.3 36.9 1.8 S

Rail 45.9�� .9 45.4 4.6 S S 26.5


Air (includes truck and air) S�� S 46.8 – S S 26.4Pipeline –�� – – – S S S

Multiple modes 33.1�� 3.3 28.3 1.1 30.1 1.1 16.8

Parcel, U.S. Postal Service or courier 33.1�� 3.3 28.3 1.1 30.1 1.1 16.8Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 45.1�� .3 47.1 .4 41.5 .4 S















SCTG 34, MACHINERY

Total 14.0�� – 24.6 – 15.6 – 21.2

Single modes 14.2�� 1.4 17.1 7.9 15.7 1.7 20.7

Truck 14.0�� 1.5 17.2 7.7 16.3 2.2 23.2For�hire truck 13.6�� 2.3 14.3 8.6 15.5 2.6 5.8Private truck 23.9�� 2.2 30.9 3.6 33.3 1.7 S




Multiple modes 14.5�� .4 23.0 .4 35.4 1.0 15.4

Parcel, U.S. Postal Service or courier 23.2�� .4 30.9 .2 47.4 .2 18.0Truck and rail 42.7�� .2 46.0 .3 47.5 .7 24.0Truck and water S�� S S S S S 28.9Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 46.2�� 1.5 S S S S S

SCTG 35, ELECTRONIC AND OTHER ELECTRICAL EQUIPMENTAND COMPONENTS AND OFFICE EQUIPMENT

Total 24.6�� – 21.1 – 29.0 – 15.2

Single modes 22.3�� 5.0 24.8 5.1 34.6 5.9 S

Truck 21.0�� 5.4 24.4 4.9 32.9 5.7 SFor�hire truck 22.4�� 8.5 30.3 9.5 35.0 8.0 5.1Private truck S�� S S S 43.8 2.9 S

Rail –�� – – – – – –



Multiple modes 46.2�� 5.0 48.5 4.7 27.2 4.2 9.1

Parcel, U.S. Postal Service or courier S�� S 19.7 1.7 24.8 3.1 9.1Truck and rail S�� S S S S S 31.6Truck and water S�� S S S S S 31.6Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 36, MOTORIZED AND OTHER VEHICLES (INCLUDINGPARTS)

Total 16.7�� – 26.8 – 29.7 – 13.0

Single modes 16.3�� 2.2 28.9 2.9 32.0 3.8 14.5


Rail –�� – – – – – –



Multiple modes 35.0�� 2.1 27.7 2.1 30.3 3.0 15.4

Parcel, U.S. Postal Service or courier 38.2�� 2.2 37.4 .7 40.2 1.0 15.6Truck and rail 46.9�� .6 49.1 2.1 49.4 3.1 25.9Truck and water S�� S S S S S 31.6Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –
















SCTG 37, TRANSPORTATION EQUIPMENT, N.E.C.

Total 42.0�� – 41.8 – 43.7 – 25.8

Single modes 42.0�� – 41.8 – 43.7 – 25.8

Truck 41.4�� 2.1 41.4 2.3 41.0 1.3 25.9For�hire truck 43.0�� 1.4 41.5 .6 48.5 .9 27.8Private truck 43.2�� 1.6 43.2 1.9 48.1 1.7 26.3

Rail 44.8�� 2.1 44.2 2.3 45.5 1.3 26.5






SCTG 38, PRECISION INSTRUMENTS AND APPARATUS

Total S�� S 38.7 – 44.9 – 33.7

Single modes S�� S 48.3 11.5 49.0 12.7 27.5

Truck S�� S S S S S SFor�hire truck S�� S S S S S 28.6Private truck S�� S S S S S S

Rail –�� – – – – – –



Multiple modes S�� S 30.2 11.5 49.0 12.7 44.3

Parcel, U.S. Postal Service or courier S�� S 30.2 11.5 49.0 12.7 44.3Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –


SCTG 39, FURNITURE, MATTRESSES AND MATTRESSSUPPORTS, LAMPS, LIGHTING FITTINGS, AND ILLUMINATEDSIGNS

Total 11.5�� – 18.8 – 21.5 – 9.3

Single modes 11.7�� 1.0 18.8 .2 21.5 .1 9.4

Truck 11.7�� 1.0 18.8 .2 21.5 .1 9.4For�hire truck 13.2�� 4.1 18.7 3.0 20.9 2.3 5.4Private truck 22.4�� 3.9 33.9 3.0 S S 20.7

Rail –�� – – – – – –



Multiple modes S�� S S S 43.0 .1 13.8

Parcel, U.S. Postal Service or courier S�� S S S 43.0 .1 13.8Truck and rail –�� – – – – – –Truck and water –�� – – – – – –Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –
















SCTG 40, MISCELLANEOUS MANUFACTURED PRODUCTS

Total 30.1�� – 22.1 – 28.4 – 43.6

Single modes 29.6�� 7.1 20.2 2.9 29.3 3.5 S

Truck 29.2�� 7.1 20.1 2.9 29.1 3.6 SFor�hire truck 26.6�� 8.4 19.5 6.3 27.2 5.4 5.3Private truck S�� S 31.4 4.4 43.2 4.2 S

Rail –�� – – – – – –



Multiple modes S�� S S S 49.4 3.6 10.5

Parcel, U.S. Postal Service or courier S�� S S S 49.3 3.6 10.5Truck and rail S�� S S S S S 31.6Truck and water S�� S S S S S 31.6Rail and water –�� – – – – – –Other multiple modes –�� – – – – – –

Other and unknown modes 45.5�� 1.2 S S S S S

SCTG 41, WASTE AND SCRAP



Truck S�� S S S S S SFor�hire truck S�� S S S S S SPrivate truck S�� S S S S S 28.9

Rail –�� – – – – – –






SCTG 43, MIXED FREIGHT

Total 10.5�� – 9.4 – 14.4 – S

Single modes 10.4�� 3.6 9.3 1.3 14.9 1.4 S

Truck 10.4�� 3.6 9.2 1.3 14.7 1.4 SFor�hire truck 29.0�� 7.9 28.4 8.5 29.6 11.4 22.0Private truck 16.6�� 10.1 15.1 8.9 17.5 11.8 49.5





















COMMODITY UNKNOWN

Total 40.1�� – 40.1 – S S 27.0

Single modes 41.1�� 9.2 41.8 7.7 S S 35.9

Truck 33.6�� 12.4 S S S S 36.2For�hire truck 33.3�� 12.3 40.7 11.0 34.2 15.8 30.2Private truck 49.7�� 10.7 S S S S 27.2


Water S�� S S S S S 31.6Shallow draft S�� S S S S S 31.6Great Lakes –�� – – – – – –Deep draft –�� – – – – – –








Table B–7. Estimated Measures of Reliability for Outbound Shipment Characteristics by Stateof Destination for State of Origin: 2002


State of destination








Total 5.9�� – 13.6 – 39.2 –

NEW ENGLAND STATES

Connecticut 42.2�� .3 31.3 – 39.1 –Maine 24.9�� – 34.4 – 37.4 –Massachusetts 15.2�� .1 22.7 – 23.8 .1New Hampshire 37.3�� – S S S SRhode Island 33.2�� – S S S SVermont 22.1�� – S S S S


New Jersey 19.4�� .2 19.5 – 19.5 .3New York 27.2�� .3 12.3 – 12.1 .2Pennsylvania 16.6�� .3 17.0 .2 17.0 .6


Illinois 11.6�� .8 18.8 1.1 21.9 1.2Indiana 8.4�� .2 12.4 .1 13.7 .2Michigan 15.9�� .4 17.3 .2 17.3 .4Ohio 11.7�� .3 S S S SWisconsin 12.9�� .4 26.2 .5 22.6 .5


Iowa 9.7�� 2.0 16.5 5.0 20.0 1.4Kansas 18.8�� .3 22.7 .2 22.5 .2Minnesota 17.7�� .7 27.2 1.1 22.7 .5Missouri 10.5�� .3 14.5 .2 16.7 .3Nebraska 15.8�� .5 31.1 1.1 27.7 .3North Dakota 25.8�� .3 23.0 – 26.7 .2South Dakota 16.9�� .1 47.2 .2 43.0 –


Delaware 23.4�� – 35.2 – 33.6 –District of Columbia S�� S S S S SFlorida 20.0�� .3 21.8 – 22.9 .3Georgia 17.3�� .3 21.9 – 24.1 .4Maryland 35.1�� .7 25.2 .1 24.9 .4North Carolina 24.3�� .3 14.7 – 14.8 .2South Carolina 26.2�� .2 43.2 – 48.5 .4Virginia 17.9�� .1 19.5 – 20.8 .1West Virginia 24.6�� – 49.5 – 49.3 –


Alabama 25.9�� .2 36.7 .3 38.0 .9Kentucky 18.7�� .1 26.1 – 28.3 .2Mississippi 21.8�� .2 36.1 .1 41.4 .4Tennessee 17.2�� .3 16.4 .1 16.1 .3


Arkansas 26.5�� .2 21.1 .1 19.8 .3Louisiana 23.2�� .6 16.0 1.8 15.8 5.4Oklahoma 24.1�� .3 15.9 .1 17.1 .3Texas 13.5�� .5 17.2 .3 17.8 1.3

MOUNTAIN STATES

Arizona 14.8�� .1 34.0 .3 35.1 2.2Colorado 13.7�� .1 21.0 – 24.4 .1Idaho 33.3�� .1 40.3 – 39.4 –Montana 25.1�� .1 32.6 – 30.2 –Nevada 32.7�� – S S S SNew Mexico 15.8�� – 43.4 – 43.1 .3Utah 21.2�� – 29.5 – 32.2 –Wyoming S�� S 45.8 – 46.1 –

PACIFIC STATES

Alaska S�� S S S S SCalifornia 29.7�� 1.3 S S S SHawaii S�� S S S S SOregon 15.7�� – S S S SWashington 31.8�� .3 29.0 – 29.8 .3




Table B–8. Estimated Measures of Reliability for Inbound Shipment Characteristics by State ofOrigin for State of Destination: 2002


State of origin








Total 5.0�� – 9.6 – 8.9 –

NEW ENGLAND STATES

Connecticut 39.1�� .2 S S S SMaine 34.0�� – S S S SMassachusetts 28.9�� .1 S S S SNew Hampshire 29.0�� – S S S SRhode Island S�� S S S S SVermont 17.7�� – 33.7 – 33.1 –


New Jersey 48.5�� .7 S S S SNew York 30.4�� .6 45.2 .1 44.2 .3Pennsylvania 25.3�� .3 26.2 – 25.9 .2


Illinois 10.8�� .7 25.4 1.7 13.0 .7Indiana 23.3�� .9 24.8 .5 23.2 .7Michigan 19.5�� .5 16.0 .1 15.3 .2Ohio 15.5�� .4 32.2 .4 34.0 .8Wisconsin 11.3�� .6 26.4 .6 29.6 .7


Iowa 9.7�� 2.0 16.5 4.8 20.0 2.2Kansas 17.5�� .4 47.8 1.3 49.1 2.0Minnesota 14.9�� .7 32.5 1.7 29.1 1.5Missouri 17.6�� .7 31.4 1.0 36.0 1.5Nebraska 12.7�� .7 23.8 .5 35.1 .6North Dakota 22.7�� – 25.0 – 24.7 –South Dakota 18.9�� .4 20.3 .4 28.8 .6


Delaware S�� S 45.8 – 48.2 –District of Columbia S�� S S S S SFlorida 17.8�� .1 S S S SGeorgia 21.4�� .2 25.3 .1 26.7 .4Maryland S�� S S S S SNorth Carolina 19.6�� .2 32.7 – 30.4 .4South Carolina 26.8�� .2 22.6 – 23.6 .2Virginia 19.4�� .1 23.1 – 28.9 .2West Virginia 28.4�� – 50.0 – 47.9 .1


Alabama S�� S 32.5 – 31.8 .2Kentucky 18.4�� .1 12.4 – 11.5 –Mississippi 25.3�� .1 46.6 .1 48.5 .3Tennessee 17.8�� .3 30.8 – 30.1 .2


Arkansas 16.9�� .1 21.5 – 26.7 .2Louisiana 36.4�� .5 30.3 .3 32.3 1.1Oklahoma 18.4�� .1 28.9 .2 29.9 .4Texas 24.3�� .6 27.8 .2 28.4 1.3

MOUNTAIN STATES

Arizona 37.6�� .2 47.0 – 46.3 .1Colorado 28.3�� .1 46.3 – 49.3 .1Idaho 18.3�� – 34.8 – 34.5 .2Montana 23.8�� – 32.0 – 30.5 .1Nevada 32.8�� – 28.9 – 29.4 –New Mexico 20.7�� – 46.9 – 48.0 .1Utah 18.6�� – S S S SWyoming 28.1�� – 31.6 2.7 34.6 6.4

PACIFIC STATES

Alaska –�� – – – – –California 34.1�� 1.3 24.0 – 23.9 .4Hawaii S�� S S S S SOregon 12.0�� – S S S SWashington 35.4�� .1 S S S S




Table B–9. Estimated Measures of Reliability for Shipment Characteristics by Mode ofTransportation for State of Origin: 2002 and 1997



Value Tons Ton�miles Average miles per shipment

Coefficient of variationof number




2002 1997

Standarderror ofpercentchange 2002 1997



Standarderror ofpercentchange

Total 5.9�� 4.3 7.7 13.6 3.9 15.0 39.2 8.9 76.1 15.7 16.5 28.1

Single modes 6.7�� 5.3 9.0 13.9 4.0 14.8 40.4 8.7 80.6 25.2 11.9 38.3

Truck 7.1�� 5.9 9.4 11.7 5.3 11.8 12.5 5.8 17.4 24.2 10.6 35.5Rail 23.5�� 9.7 30.0 49.2 15.1 76.9 S 19.7 S 4.1 4.2 6.1Water 16.8�� 27.6 36.4 18.7 31.9 52.7 19.1 32.6 52.6 11.1 10.9 16.7Air (includes truck and air) S�� 26.8 S S 39.6 S S 47.7 S 8.4 8.7 15.6Pipeline S�� S S S S S S S S S S S

Multiple modes 18.3�� 13.7 22.9 35.7 43.8 41.0 40.0 S S 6.9 8.1 12.7

Parcel, U.S. Postal Service or courier 15.5� 14.1 19.5 16.6 16.9 23.6 21.2 20.1 38.2 6.9 8.2 12.7Truck and rail S�� 28.0 S 41.0 26.6 16.8 41.5 30.2 18.6 14.3 13.2 18.7All other multiple modes 48.4�� S S S S S S S S 32.4 S S

Other and unknown modes 33.4�� 17.9 40.5 S 17.5 S S 33.6 S S 40.8 S



Table B–10. Estimated Measures of Reliability for Shipment Characteristics by CommodityGroup for State of Origin: 2002 and 1997



Value Tons Ton�miles Average miles per shipment





2002 1997




Standarderror ofpercentchange

Total 5.9�� 4.3 7.7 13.6 3.9 15.0 39.2 8.9 76.1 15.7 16.5 28.1

01�05 Agricultural products andfish 25.6�� 11.2 21.3 29.8 9.5 34.8 S 17.0 S 22.8 24.4 85.5

06�09 Grains, alcohol, and tobaccoproducts 25.6�� 15.5 29.5 29.9 6.7 37.1 25.6 11.6 29.2 21.4 7.9 92.7

10�14 Stones, nonmetallic minerals,and metallic ores 27.6�� S S 26.2 20.9 34.5 S 40.2 S 20.5 38.6 47.7

15�19 Coal and petroleumproducts 28.7�� 19.2 33.3 26.6 22.7 27.6 44.2 21.5 93.9 S 25.9 S

20�24 Basic chemicals, chemical,and pharmaceuticalproducts 15.2�� 14.6 29.0 25.7 12.7 74.7 26.7 16.9 69.4 21.3 15.3 41.7

25�30 Logs, wood products, andtextile and leather 27.3�� 4.8 34.2 36.4 13.1 55.7 41.2 15.5 78.6 12.5 15.1 21.3

31�34 Base metal and machinery 8.7�� 10.8 15.5 15.4 10.4 11.9 13.5 7.4 16.7 21.1 18.2 34.835�38 Electronic, motorized

vehicles, and precisioninstruments 14.2�� 14.4 20.5 23.5 11.7 26.0 25.6 14.8 33.7 9.1 22.0 37.7

39�43 Furniture, mixed freight andmisc. manufactured prod. 11.7�� 22.8 39.0 7.0 25.1 19.6 10.7 13.0 15.9 41.7 9.5 23.9

�� Commodity unknown 40.1�� 43.5 20.8 40.1 S S S S S 27.0 33.0 164.4




Appendix C.Sample Design, Data Collection, andEstimation

INTRODUCTION

The primary goal for the 2002 Commodity Flow Survey (CFS) is to estimate shipping volumes(value, tons, and ton-miles) by commodity and mode of transportation at varying levels of geo-graphic detail. A secondary objective is to estimate the volume of shipments moving from onegeographic area to another (i.e., flows of commodities between states, regions, etc.) by mode andcommodity. A detailed description of the sample design for the 2002 CFS is provided below.

SAMPLE DESIGN

The sample for the 2002 Commodity Flow Survey (CFS) was selected using a stratified three-stagedesign in which the first-stage sampling units were establishments, the second-stage samplingunits were groups of four 1-week periods (reporting weeks) within the survey year, and the third-stage sampling units were shipments.

First Stage

Sampling frame

To create the first-stage sampling frame, we extracted a subset of establishment records from theBusiness Register (formerly the Standard Statistical Establishment List) as of September 2001. TheBusiness Register is a database of all known establishments located in the United States or its ter-ritories. (An establishment is a single physical location where business transactions take place orservices are performed.) Establishments located in the United States, having nonzero payroll in2000, and classified in mining (except oil and gas extraction), manufacturing, wholesale, or elec-tronic shopping and mail order retail industries, as defined by the 1997 North American IndustryClassification System (NAICS), were included on the sampling frame. Auxiliary establishments (e.g.warehouses and central administrative offices) with shipping activity were also included on thesampling frame. Auxiliary establishments are establishments that are primarily involved in render-ing support services for other establishments within the same company, instead of for the public,government, or other business firms. All other establishments included on the sampling frame arereferred to as nonauxiliary establishments.

Some portion of establishments classified in the Retail Trade sector in the 1997 Economic Censuswas expected to be classified in the Wholesale Trade sector in the 2002 Economic Census.Because we wanted complete coverage of the Wholesale Trade sector as defined for the 2002 Eco-nomic Census, the 2002 CFS sampling frame also included establishments that were classified inparticular retail industries (automotive parts and accessories, tires, floor coverings, building mate-rials, nursery and garden, and office supplies) in the 1997 Economic Census and had characteris-tics indicating that they were likely to be classified as wholesale in the 2002 Economic Census. Ofthe establishments selected for the 2002 CFS from this set of establishments, only those thatwere classified as wholesale in the 2002 Economic Census were used in the production of esti-mates for this report.

Establishments classified in forestry, fishing, utilities, construction, transportation, services, andall other retail industries were not included on the sampling frame. Farms and government-ownedentities (except government-owned liquor stores) were also excluded from the sampling frame.The resulting frame comprised approximately 760,000 establishments.

For each establishment we extracted sales, payroll, number of employees, a six-digit NAICS code,name and address, and a primary identifier. We also computed a measure of size for each estab-lishment. The measure of size was designed to approximate an establishment’s annual total valueof shipments for the year 2000.

Appendix C C–1Transportation—Commodity Flow Survey


All of the establishments included on the sampling frame had state, county, and place geographiccodes. We used these codes to assign each establishment to one of the 273 metropolitan areas(MAs) defined as a combination of the metropolitan statistical areas (MSAs) and consolidated met-ropolitan statistical areas (CMSAs). Establishments not located in an MA were assigned to MA9999.

Stratification

We stratified the sampling frame by geography and industry. Geographic strata were defined by acombination of the 50 states, the District of Columbia, and the top 50 metropolitan areas (MAs)based on their population in Census 2000. If a particular MA was not one of the 50 largest, then itwas collapsed with the remaining MAs and non-MAs within the state in which the particular MAresided. We refer to these collapsed strata as Rest of State (ROS) strata. When an MA crossed stateboundaries, we considered the size of each part of the MA relative to the MAs total measure ofsize when determining whether or not to create strata in each state in which the MA was defined.The industry strata were determined as follows. Within each of the geographic strata, we startedwith a total of 45 industry groups based on 1997 NAICS: three mining (four-digit NAICS); 21manufacturing (three-digit NAICS); 18 wholesale (four-digit NAICS); 1 retail (NAICS 4541); and 2auxiliary (NAICS 4931 and 5511). We then implemented a rule that states a particular industrystratum will be defined within a geographic stratum if it contributes at least 2 percent to its corre-sponding state total measure of size or it contributes at least 2 percent to the national total mea-sure of size for the industry. Industry groups not meeting these criteria were combined into atmost 12 new collapsed industry strata using a clustering algorithm. Because of potential differ-ences in shipping patterns between auxiliary and nonauxiliary establishments, we created twoindustry strata of auxiliary establishments in every geographic stratum. We refer to a particulargeographic-by-industry combination as a primary stratum. Also note that a separate stratum wascreated at the national level for those Retail Trade sector establishments that we included in oursample.

Sample size and allocation

To reduce the sampling variability of the estimates, we used a stratified design with a certaintycomponent. Within each primary stratum, a boundary (or cutoff) that divides the certainty estab-lishments from the noncertainty establishments was determined using the Lavallee-Hidirogloualgorithm. If an establishment’s measure of size was greater than the cutoff, the establishmentwas selected with certainty. Establishments selected with certainty were sure to be selected andrepresent only themselves (i.e., had a selection probability of one and a sampling weight of one).

Because the 2002 sample was about half the size of the 1997 CFS sample, we were concernedabout the ability of the sample to capture less frequent types of shipments (e.g., air, water, rail,and hazardous materials). After considering several different alternatives, we felt the bestapproach was to identify those establishments which made the bulk of these types of shipmentsin 1997 and then select them with certainty. To identify these establishments, we proceeded asfollows.

We identified all establishments in the 1997 CFS sample that reported shipments made by air,water, or rail. We also identified those establishments that reported shipments of hazardous mate-rials. For each of these establishments, we computed the percentage of the establishment’s totalvalue and tonnage accounted for by each of these types of shipments. Next, we matched theseestablishments to the sampling frame for the 2002 CFS and identified each establishment withmeasure of size less than the certainty boundary. For both value and tons, we then looked to seewhat percent of the total volume of shipments for each type of shipment was captured by select-ing with certainty the top 50, top 100, or all establishments. We considered the top 50 establish-ments as those establishments making the largest volume of each type of shipment (air, water,rail, hazardous). Once these establishments were identified, we grouped them into one file andunduplicated them. This procedure added a total of about 500 certainty establishments.

Establishments not selected with certainty made up the noncertainty frame. We further stratifiedthe noncertainty establishments within each primary stratum using the measure of size previouslydescribed. We refer to these measure-of-size strata as substrata of the primary strata. The mea-sure of size stratification increased the efficiency of the sample design. The Dalenius-Hodges

C–2 Appendix C Transportation—Commodity Flow Survey


cumulative �f rule was used to set the substratum boundaries. We then used optimum allocationto determine the sample size required within each substratum to meet a coefficient of variationconstraint on an estimate of the total measure of size for the primary stratum. Within each sub-stratum, a simple random sample of establishments was selected without replacement.

To arrive at the final sample size, we allocated additional establishments to some of the strata sothat the minimum substratum sample size was two and the probability of selecting any establish-ment was no less than 1 in 100. In total, the first-stage sample comprised 51,005 establishments.

Second Stage

The frame for the second stage of sampling consisted of 52-weeks from January 6, 2002 to Janu-ary 4, 2003. Each establishment selected into the 2002 CFS sample was systematically assignedto report for four reporting weeks-one in each quarter of the reference year. Each of the 4-weekswas in the same relative position of the quarter. For example, an establishment might have beenrequested to report data for the 5th, 18th, 31st, and 44th weeks of the reference year. In thisinstance, each reporting week corresponds to the 5th week of each quarter. Prior to assignment ofweeks to establishments, we sorted the selected sample by primary stratum (state x metropolitanarea x industry) and measure-of-size.

Third Stage

For each of the four reporting weeks in which an establishment was asked to report, we requestedthe respondent to construct a sampling frame consisting of all shipments made by the establish-ment in the reporting week. Each respondent was asked to count or estimate the total number ofshipments comprising the sampling frame and to record this number on the questionnaire. Foreach assigned reporting week, if an establishment made more than 40 shipments during thatweek, we asked the respondent to select a systematic sample of the establishment’s shipmentsand to provide us with information only about the selected shipments. If an establishment made40 or fewer shipments during that week, we asked the respondent to provide information aboutall of the establishment’s shipments made during that week; i.e., no sampling was required.

DATA COLLECTION

Each establishment selected into the CFS sample was mailed a questionnaire for each of its fourreporting weeks. We mailed each establishment a questionnaire once every quarter of 2002. For agiven establishment, we requested that the respondent provide the following information abouteach of the establishment’s reported shipments: shipment identification number, the date onwhich the shipment was made, value, weight, commodity, mode(s) of transportation, domesticdestination or port of exit, an indication of whether the shipment was an export, and the UnitedNations or North America (UN/NA) number for hazardous material shipments. For a shipment thatincluded more than one commodity, the respondent was instructed to report the commodity thatmade up the greatest percentage of the shipment’s weight. For an export shipment, we also askedthe respondent to provide the mode of export and the foreign destination city and country. SeeAppendix E for a copy of the questionnaire.

IMPUTATION OF SHIPMENT VALUE OR WEIGHT

To correct for nonresponse to either the value or weight item for a given shipment reported in theCFS, the missing value or value that failed edit is replaced by a predicted value obtained from anappropriate model. Such a shipment is considered a ‘‘recipient’’ if its commodity code is valid andthe other item is reported greater than zero and passed edit. The recipient’s item that is missingor failed edit is imputed as follows. First, a ‘‘donor’’ shipment is randomly selected from ship-ments that were reported in the CFS with:

• The same commodity code as the recipient.

• Both value and weight items reported greater than zero and passed edit.

• Origin and value for the item reported by the recipient similar to those of the recipient.



Then, the donor’s value and weight data are used to calculate a ratio, which is applied to therecipient’s reported item, to impute the item that is missing or failed edit. If no donor is found,the median ratio for all shipments reported in the survey with the same commodity code as therecipient and with both value and weight items reported greater than zero is applied to the recipi-ent’s reported item. For either the value or weight item, about 3 percent of the shipment recordsinput to the calculation of estimates have imputed data for the item.

ESTIMATION

Estimated totals (e.g., value of shipments, tons, ton-miles) are produced as the sum of weightedshipment data (reported or imputed). Percent change and percent-of-total estimates are derivedusing the appropriate estimated totals. Estimates of average miles per shipment are computed bydividing an estimate of the total miles traveled by the estimated number of shipments. The annu-alized growth rate A for estimates from year y1 to y2 is computed as:

A � 100 * (�X y2

X y1

1��y2�y1�

� 1)where Xy1

and Xy2are estimates of the value of shipments, tons, ton-miles, or average miles per

shipment for years y1 and y2, respectively. The annualized growth rate measures the annual rateof change between estimates from any 2 years by assuming a constant yearly rate of change.

Each shipment has associated with it a single tabulation weight, which was used in computing allestimates to which the shipment contributes. The tabulation weight is a product of seven differentcomponent weights. A description of each component weight follows.

CFS respondents provided data for a sample of shipments made by their respective establish-ments in the survey year. For each establishment, we produced an estimate of that establish-ment’s total value of shipments for the entire survey year. To do this, we used four differentweights, the shipment weight, the shipment nonresponse weight, the quarter weight, and thequarter nonresponse weight.

Like establishments, we identified shipments as either certainty or noncertainty. (See the Nonsam-pling Error section in Appendix B for a description of how certainty shipments were identified.)For noncertainty shipments, the shipment weight was defined as the ratio of the total number ofshipments (as reported by the respondent) made by an establishment in a reporting week to thenumber of sampled shipments for the same week. This weight uses data from the sampled ship-ments to represent all the establishment’s shipments made in the reporting week. However, arespondent may have failed to provide sufficient information about a particular sampled ship-ment. For example, a respondent may not have been able to provide value, weight, or a destina-tion for one of the sampled shipments. If this data item could not be imputed, then this shipmentdid not contribute to tabulations and was deemed unusable. (A usable shipment is one that hasvalid entries for value, weight, and origin and destination ZIP Codes.) To account for these unus-able shipments, we applied the shipment nonresponse weight. For noncertainty shipments from aparticular establishment’s reporting week, this weight is equal to the ratio of the number ofsampled shipments for the reporting week to the number of usable shipments for the same week.The shipment weight for certainty shipments from a particular establishment’s reporting week isequal to one.

The quarter weight inflates an establishment’s estimate for a particular reporting week to an esti-mate for the corresponding quarter. For noncertainty shipments, the quarter weight is equal to 13.The quarter weight for most certainty shipments is also equal to 13. However, if a respondent wasable to provide information about all large (or certainty) shipments made in the quarter containingthe reporting week, then the quarter weight for each of these shipments was one. For each estab-lishment, the quarterly estimates were added to produce an estimate of the establishment’s valueof shipments for the entire survey year. Whenever an establishment did not provide the CensusBureau with a response for each of its four reporting weeks, we computed a quarter nonresponse

C–4 Appendix C Transportation—Commodity Flow Survey


weight. The quarter nonresponse weight for a particular establishment is defined as the ratio ofthe number of quarters for which the establishment was in business in the survey year to the totalnumber of quarters (reporting weeks) for which we received usable shipment data from the estab-lishment.

Using these four component weights, we computed an estimate of each establishment’s value ofshipments for the entire survey year. We then multiplied this estimate by a factor that adjusts theestimate using value of shipments and sales data obtained from other surveys and censuses con-ducted by the Census Bureau. This weight, the establishment-level adjustment weight, attempts tocorrect for any sampling or nonsampling errors that occur during the sampling of shipments bythe respondent.

The adjusted value of shipments estimate for an establishment was then weighted by the estab-lishment weight. This weight is equal to the reciprocal of the establishment’s probability of beingselected into the sample.

A final adjustment weight, the industry-level adjustment weight, uses information from other sur-veys and censuses conducted by the Census Bureau to account for establishments from which wedid not receive a response (including establishments from which we did not receive any usableshipment data) and for changes in the population of establishments between the time the first-stage sampling frame was constructed (2001) and the year in which the data were collected(2002). Separate industry-level adjustment weights were determined for nonauxiliary and auxil-iary establishments.



Appendix D.Standard Classification of Transported GoodsCode Information

The commodities shown in this report are classified using the Standard Classification of Trans-ported Goods (SCTG) coding system. The SCTG coding system was created jointly by agencies ofthe United States and Canadian governments based on the Harmonized System of product classifi-cation that is used worldwide. The purpose of the SCTG coding system was to specifically addressstatistical needs in regard to products transported.

In 1993, Commodity Flow Survey (CFS) data were collected and reported using product classifica-tions found in the Standard Transportation Commodity Classification (STCC) system. These classi-fications were developed in the early 1960s by the American Association of Railroads (AAR) toanalyze commodity movements by rail. The original purpose of the STCC was for identification ofcommodities for purposes of assigning rates for Interstate Commerce Commission (ICC) regulatedrail carriers. The STCC continues to be used by the AAR as a tariff mechanism.

At the time that the Commodity Transportation Survey (CTS) (the CTS—the predecessor of the CFS)was first conducted in 1963, STCC codes were still useful for analyzing most important aspects ofthe U.S. transportation system. Since then, many changes have taken place that have graduallymade the STCC code less useful for tracking domestic product movements across all modes(although it remains perfectly functional for tracking rail-only movements). These include thederegulation of trucking, the enactment of North American Free Trade Agreement (NAFTA),changes in logistics practices, the emergence of plastics and composite materials to replace met-als and glass, the obsolescence of many categories of wood products, and the very rapid recentdevelopment of high-tech electronic goods. Because the CFS is a shipper survey, the CFS collectsinformation about shipments moving on all modes. As a consequence, STCC classifications fre-quently provide inadequate detail for identifying products that are significant for modes, such astruck and air. It is for these reasons that the Bureau of Transportation Statistics (BTS) has spon-sored the development of a new product code to collect and report CFS data.

In 1997 and 2002, the CFS provided respondents with a listing of SCTG codes and descriptions atthe five-digit level to use in assigning a commodity code for each shipment. For shipments ofmore than one commodity, we instructed respondents to use the five-digit code for the majorcommodity, defined as the commodity of greatest total weight in the shipment. For the data pre-sented on this report, we aggregated the SCTG codes to the two-digit level.

Appendix D D–1Transportation—Commodity Flow Survey


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Iowa: 2002 - Census.gov · Forestry, and Fishing sector under the SIC system: landscape agricultural services, landscaping services, veterinary services, and pet care services. Printed