United States Department of Transportation
i
Weigh-in-motion for planning applications in Louisiana : final report.
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1988-04-01
[PDF-142.87 KB]
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Abstract:Weigh-In-Motion (WIM) is a method of weighing vehicles at highway speeds with the use of scales on or flush with the road surface. It has been used experimentally in Louisiana since 1976, but until recently little was done to prove its accuracy and usefulness as a highway design or planning tool. In this study, two WIM locations were selected near permanent Louisiana Department of Transportation and Development (LDOTD) scales to provide weight comparisons between dynamic (WIM) weighing and static (stationary) weighing. At present, the LDOTD Traffic and Planning Section collects weights every other year at 12 sites for approximately four hours at each site, using portable scales. This procedure is very labor intensive, requiring 10 to 15 persons, and provides only a small data base. Using the WIM system, a large data base was collected over an 18-month period utilizing only 2 to 3 persons.
After processing the WIM data, between 80 to 85% of WIM vehicles collected were usable for analysis. Manual traffic counts were used to supplement WIM vehicle counting. Statistical analysis showed that there is very good correlation between WIM, static and portable scales. An analysis of the WIM data was used to calculate EAL (18-kip equivalent axle load) design factors at both sites. Based on the accuracy of the WIM system established in this study, it was recommended that WIM equipment be used at various locations to show variations of truck loading for design purposes.
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