Evaluation of the percent of overloaded vehicles receiving proper permits.
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2015-05-01
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Abstract:All state agencies have truck size and weight restrictions on their roadways based on federal and state
legislation. However, drivers can typically apply for special permits allowing those limits to be exceeded,
particularly when the load is non-divisible. The permit application often includes the origin and
destination of the load, as well as characteristics about the truck’s size and weight. This information is
used by state highway agencies to evaluate the impact of the loading on the roads and bridges that the
vehicle will cross to determine a preferred route and the need for a police escort. The primary objective
of this project is to estimate the percentage of overweight trucks on West Virginia highways that are not
properly permitted by comparing truck weight data measured by weigh-in-motion (WIM) systems and
oversize/overweight permit records. Analysis of the WIM data revealed concerns with the accuracy of
the weight data. Therefore, a tuning procedure was developed to adjust the data based on national truck
characteristics. The route information in the permit database was processed in GIS to determine which
WIM stations the permitted vehicle should have crossed. The percentage of overweight trucks were
calculated for five locations using one week of data in 2011. The percentage of overweight trucks
without proper permits ranged from 2% to 46% based on the adjusted WIM data.
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