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Office of Highway Policy Information

FHWA Home / Policy & Governmental Affairs / Highway Policy Information / Traffic Monitoring Guide (2022)

Traffic Monitoring Guide

Appendix M. Double Threshold WIM Array

 

This array is the FHWA preferred WIM array to use.

A top-down diagram of a four-lane divided highway with a Weight-In-Motion (WIM) sensor array. Each lane contains one rectangular inductive loop and four staggered vertical sensor lines, arranged so that both the left and right wheel paths are measured twice as vehicles pass over the array.

Source: FHWA 2016 TMG

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