National Center for Statistics & Analysis 1

Use of Data Collected by the National Center for Statistics

and Analysis

Tuesday, March 28, 2006

Presented by: Joseph S. Carra, Associate Administrator, NCSA

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Examples

1. Nopus and Seatbelt Use2. Electronic Stability Control3. FARS and Geospatial Coding

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Nopus and Seatbelt Use

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A Primary Use of Traffic Safety Data

One way that we use data is to:

• determine a safety countermeasure, and

• after implementation of the countermeasure, assess its effectiveness

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An Example

One of NHTSA’s priorities is to increase safety belt use.

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Using Data to Identify a Countermeasure

Historically, belt use has been lower than average in rural communities, and among pickup occupants:

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Identify Countermeasure, Continued

80%

76%70%

50%

60%

70%

80%

90%

100%

Pickup Trucks Rural Areas Nationwide

2004

Belt

Use

Safety Belt Use in 2004

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Implementing the Countermeasure

In 2005, NHTSA chose to focus its Click It or Ticket belt campaign on these two areas – rural areas and pickup occupants:

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Analyzing Countermeasure Effectiveness

76%70%

79%73%

50%

60%

70%

80%

90%

100%

Pickup Trucks Rural Areas

2004 2005

Belt

Use STATISTICALLY

SIGNIFICANTINCREASE

STATISTICALLYSIGNIFICANT

INCREASE

The countermeasure was a success!

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Electronic Stability Control

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Analyzing effectiveness of emerging technology and quickly

disseminating results leads to appropriate market response.

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How does ESC function?

Anticipates dangerous situations Automatically intervenes Brakes one wheel Corrects over steer and under steer Prevents skids, spins Reduces situations leading to run-

off-road and rollovers

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Databases: ESC

FARS, 1997-2003 NCSA State Data

Florida, 1997-2002 Illinois, 1997-2002Maryland, 1997-2002Missouri, 1997-2002Utah, 1997-2002

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Data Sample: ESC

Passenger Cars• Mercedes-Benz and BMW models – 61 percent• Luxury GM models – 23 percent• Models from other manufacturers (Acura,

Audi, Lexus, and VW) – 16 percent

SUVs• Mercedes-Benz models (ML320, ML350,

ML430, ML500, G500, G55 AMG) – 22 percent• Toyota models (4Runner, Land Cruiser) – 41

percent• Lexus models (RX300, LX470) – 37 percent

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Analysis Method: ESC

Compute ratios of single vehicle crash involvements (excluding pedestrians, bicycles, animals) to multi-vehicle crash involvements (control group).

Compute percentage reductions in these ratios in vehicles with ESC vs. vehicles of the same make-models without ESC.

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2004 ESC Effectiveness Results

In the US, it is estimated that stability control could save 7,000 lives per year.

Passenger Cars

Sport Utility

Vehicles

Fatal single vehicle crash

reduction30% 63%

All single vehicle crash reduction 35% 67%

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Resulting Actions

2004-2006, research leading to rulemaking In 2005, 20% of new vehicles had ESC as

opposed to 10% in 2004. General Motors has announced that by the year

2010, ESC will be standard equipment on all vehicles made.

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GIS Data within FARS

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The addition of new data element to an existing data system adds a whole new

dimension to the use of the data systems.

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FARS

Congressional Districts

School Districts

Air Medical Services Fly Zones

Which School Districts have high fatal crash incidents?

What are crash rates for Congressional districts?

Is there a significant relationship between survivorship and distance to EMS centers?

And, a countless number of other traffic safety questions...

Primary users of this system are traffic engineers…It is used to identify roadway, signage, design and or traffic signal problems.

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US Census Dept Spatial Data

http://www.census.gov/geo/www/cob/metadata.html

Alaska Native Regional CorporationsAmerican Indian Areas/Alaska Native Areas/Hawaiian Home

LandsCensus Block GroupsCensus DivisionsCensus RegionsCensus TractsCongressional DistrictsConsolidated CitiesCounty and County Equivalent AreasCounty SubdivisionsIncorporated Places/Census Designated PlacesMetropolitan and Micropolitan Statistical AreasNew England County Metropolitan AreaNew England City and Town AreasOregon Urban Growth AreasPublic Use Microdata AreasSchool Districts – Elementary, Secondary, UnifiedState and State Equivalent AreasState Legislative DistrictsTraffic Analysis ZonesTribal Block Groups/Tribal Census Tracts Urban AreasVoting Districts ZIP Code Tabulation Areas

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FARS GIS Reporting

Year Lat-Long Entered Total Cases Entered % Lat-Long Entered

2001 30,901 37,862 81.6%

2002 35,455 38,491 92.1%

2003 35,710 38,447 92.9%

2004(*) 34,746 38,443 90.1%

2005(*) 29,663 33,423 88.7%

(*) Denotes active date entry.

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Geocoding Crash Locations

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#1

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Massachusetts Regional Planning Agencies