Weight-In-Motion (WIM)

General Description:

Weigh-In-Motion is a technology for determining the weight of a commercial vehicle without requiring it to stop on a scale.  The system uses Automated Vehicle Identification (AVI) to identify the vehicles; employs technologies that measure the dynamic tire forces of the moving vehicle, and then estimates the corresponding tire loads for a static vehicle.  The system may be used in conjunction with an Automated Vehicle Classification (AVC) system.  Vehicles that do not meet weight requirements are notified with Dynamic Message Signs (DMS).

Effects of Solution:

þ Increase Passenger Throughput (Helps classify vehicles such as transit)

¨ Increase Roadway Capacity

¨ Manage System Efficiency (

þ Reduce Local Demand (Alternate routes can be advised)

Examples of Implementation:

See the Additional Resources section below.

Cost/Financial Information:

Source: United States Department of Transportation Intelligent Transportation Systems ITS Benefits, Costs and Lessons Learned Databases.  Available at http://www.benefitcost.its.dot.gov (Cost/financial information is estimated, and will vary based on size and scope of project, number of units, etc.)

	Capital Cost	Operating Cost
Weight-In-Motion Facility	$150-780K	$21.5K

The facility cost includes the WIM fixed load cell and interface to roadside facility.  Operating cost does not include personnel.

Additional Resources:

Washington State DOT Commercial Vehicle Information Systems and Network: http://cvisn.wsdot.wa.gov/

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