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Oregon
Department of
Transportation
OregonGreen Light Project
Mainline Preclearance Systems Weigh-in-Motion (WIM) Scales Automated Vehicle Identification (AVI) Systems Transponders
Travel Advisory Systems Downhill Speed Information Systems Road Weather Information Systems (RWIS)
How Is This Accomplished?• Weigh-In-Motion systems check the
vehicles weight and height
• An automatic vehicle identification reader checks state records for registration, tax status, safety inspection status
• The driver is signaled with an in-cab device to either Report to the station or Bypass
Transponder readerTransponder reader
Over-Height detectorOver-Height detector
Weigh-in-motion Weigh-in-motion single load cells and single load cells and axle sensorsaxle sensors
MainlineMainline PreclearancePreclearance
Oregon Green Light System Checks:
Truck Size, Weight, Height
Transponder Signal to Identify Vehicle/Carrier
Records Related to Registration, Tax, and Safety
Single-Load-Cell (SLC) Scale Installation
Axle Sensor Installation
Loop Detectors System Electronics
Automated Vehicle Identification (AVI)& Over Height Detection
AVI Antennas
Infra-redOver Height Sensor
TYPICAL SITE LAYOUTTYPICAL SITE LAYOUTAVI READERS READ THE TRUCK’S TRANSPONDER
WIM SCALES MEASURE THE VEHICLE’S WEIGHT
LOOPS AND AXLE SENSORS DETERMINE LENGTH, SPEED
AND AXLE SPACING
TYPICAL SITE LAYOUTTYPICAL SITE LAYOUTAVI READERS READ THE TRUCK’S TRANSPONDER
WIM SCALES MEASURE THE VEHICLE’S WEIGHT
LOOPS AND AXLE SENSORS DETERMINE LENGTH, SPEED
AND AXLE SPACING
OVER HEIGHT DETECTOR CHECKS IF THE VEHICLE IS
OVER LEGAL HEIGHT
TYPICAL SITE LAYOUTTYPICAL SITE LAYOUTAVI READERS READ THE TRUCK’S TRANSPONDER
WIM SCALES MEASURE THE VEHICLE’S WEIGHT
LOOPS AND AXLE SENSORS DETERMINE LENGTH, SPEED
AND AXLE SPACING
AVI READERS SEND A RED OR GREEN LIGHT TO THE
TRANSPONDER
OVER HEIGHT DETECTOR CHECKS IF THE VEHICLE IS
OVER LEGAL HEIGHT
TYPICAL SITE LAYOUTTYPICAL SITE LAYOUT
AVI READERS SEND A RED OR GREEN LIGHT TO THE
TRANSPONDER
AVI READERS READ THE TRUCK’S TRANSPONDER
WIM SCALES MEASURE THE VEHICLE’S WEIGHT
LOOPS AND AXLE SENSORS DETERMINE LENGTH, SPEED
AND AXLE SPACING
Green Light
OVER HEIGHT DETECTOR CHECKS IF THE VEHICLE IS
OVER LEGAL HEIGHT
Mainline Preclearance
TranspondersDedicated Short-Range Communications
22 Oregon weigh stations
operational
Green Light sites
1,600,000
1,400,000
1,200,000
1,000,000
800,000
600,000
400,000
200,000
01999 2001 2003 2005 2007 2009 2011
17,615
850,000
1,100,000
1,425,0001,500,000
MCTD began keeping track of the number of trucks that “bypassed” weigh stations in January 1999. Four weigh stations were preclearing an average of 51 trucks a day.
There are now 22 stations preclearing 4,400 trucks a day.
Today, nearly 4,200companies
are equipped
Withmore than
40,000transponders
1,375,000
1,606,000
Information from the American Trucking
Association estimates the cost of operating a truck to be $1.96/minute.
An independent evaluation determined that the average time a truck spends in a weigh
station is five-to-eight minutes.
Based on these figures the carrier industry overall currently saves more than 125,000 hours of travel time and $14.7 million in
operating cost annually.
Types of Data Collected• Individual axle weights• Axle group weights• Gross Vehicle Weight (GVW)• Axle spacings• Vehicle Classification• Date/Time stamp• Reports (hourly, daily, weekly, monthly)• Speed• Equivalent Single Axle Load’s• Weight warning/violation
Benefits of Data CollectionState Government — Where taxpayers demand
efficiency and cost savings
Highway Planning Traffic volume counts Vehicle classifications Frequency patterns (minimum/peak) Build for longevity (performance-based)
Bridge Planning Designs based on Weight/Configuration data Repair/Re-design of existing structures (change in patterns)
Infrastructure Preservation Save an estimated $20 million annually in Oregon in maintenance costs Address the problem with pavement damage from overweight trucks,
estimated to cost the U.S. $670 million annually
OSUOSU
“Green Light Preclearance Systems identify and stop more overweight trucks that would otherwise be allowed to proceed and cause millions in highway pavement damage”
Dr. Chris Bell
Independent EvaluationIndependent Evaluation
The “Green” Light ProgramThe DEQ completed emissiontesting in 2008. The resultsfound that trucks bypassing a weigh station experienceda 57% increase in fueleconomy, and reduced harmful pollutants (particulate matter, carbon dioxide, carbon monoxide, nitrogen oxides, and hydrocarbons) by 36% to 67%. One study in particular found that these reductions achieve the highest per-value ton of pollutant reduced.
Winner of a 2000 Winner of a 2000 “Best of ITS” “Best of ITS” AwardAward
Semi-finalist Semi-finalist 2001 JFK 2001 JFK Harvard Harvard “Innovations in “Innovations in Government” Government” AwardAward
The Green Light weigh station preclearance program is a winner of the top award in the American Association of State Highway Transportation Officials (AASHTO) 2002 Team Excellence Program. The “Exemplary Partner” award recognizes the work of ODOT’s Green Light team.
• 64 teams from around the U.S. entered the competition.
2002 AASHTO Award2002 AASHTO AwardOregon Green Light wins AASHTO Oregon Green Light wins AASHTO
Excellence awardExcellence award
Comments Comments oror Questions? Questions?
Contactthe
Oregon Department of Transportation
David [email protected]
503-378-6054