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Research Reports

Truck Weight Using the FHWA Bridge Weigh-In-Motion (WIM) System

Description: This report documents Washington state's experiences with the FHWA's bridge weigh-in-motion system. The system was tested on four concrete bridges (one arched slab, one box girder and two pre-tensioned concrete girders) with moderate to heavy traffic volumes.

The system gave reasonable axle and gross vehicle weights under ideal conditions, but showed major limitations under high volumes. Over the life of the project, mean gross vehicle weight errors for individual trucks ranged between 11 and 18 percent with tandem and single axle weights having high mean errors. Errors for mean population gross vehicle weight estimates averaged two percent.

  • Date Published: February, 1987
  • Publication Number: WA-RD 92.1
  • Last Modified: June 20, 2007
  • Authors: Mark E. Hallenbeck, John Hooks.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 94 p., 2,410 KB (PDF)
  • Subject: Arch bridges, Axle loads, Box girder bridges, Concrete bridges, Girder bridges, Gross vehicle weight, Highway bridges, Tandem axle loads, Traffic volume, Truck traffic, Trucks, Weight, Weigh in motion, Weigh in motion scales.
  • Keywords: Weigh-in-motion, WIM, trucks, truck weights, scales.
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This abstract was last modified April 29, 2008