Truck Weight Enforcement using Advanced Weigh-in-Motion Systems – OU06-WIM

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Truck Weight Enforcement using Advanced Weigh-in-Motion Systems – OU06-WIM


Oklahoma Department of Transportation

Research Team:

Jim Sluss, Robert C. Huck, Monte P. Tull, Thordur Runolfsson

Universities Involved:

University of Oklahoma

Start Date:


End Date:



This project introduces Weigh-In-Motion (WIM) technology, a measurement system composed of sensors and scales of technology able to measure the actual loads being applied to a roadway by a moving truck benefiting the trucking industry, taxpayers, and the states, as well as protecting highway infrastructure.
Truck weight enforcement is an important component in preserving and extending the life of Oklahoma’s roads and bridges. Weigh-in-Motion (WIM) technology is a tool that can assist the Oklahoma Department of Transportation (ODOT) and the Oklahoma Highway Patrol (OHP) in their efforts to reduce damage to transportation infrastructure. This proposal focuses on three tasks:

1. A pre-defined demonstration project at ODOT’s McAlester WIM site using advanced vehicle imaging and wireless communications technology to allow OHP officers to more effectively intercept overweight violators,

2. A survey of other state DOTs to determine “best practices” for oversize/overweight vehicle enforcement,

3. A determination of the best mix of technology based on Oklahoma’s transportation system and the development of a plan for deployment of WIM-based technology for oversize/overweight vehicle enforcement throughout Oklahoma.
Advanced Weigh?in?Motion is a technology that can be used to reduce wear and increase the life of roads. While this technology is not capable of performing the task itself, it is capable of providing a deterrent to truck operators who may contemplate operating over the weight limit. Advanced WIM sites can be set up in a cost effective manner and do not need to be manned 24 hours a day. By manning these sites at random, truck operators cannot predict their safe passage while operating overweight.

The camera and network technology that was demonstrated with this project proves that unmanned sites also have value. By capturing images and license plate information, suspected violators can be inspected at any point down the road for compliance. Repeated tagging of suspected vehicles could lead to a more extensive inspection of the operator and their operations.

Sensor technology is still lacking in accuracy when thinking of unmanned weight enforcement. Road geometries, truck dynamics, and weather have too great of an effect on sensor accuracy. While modern sensors have good accuracy, their cost of installation, maintenance, and need for periodic calibration make them unattractive.