United States Department of Transportation
i
Impact of Permit Vehicles on Bridges and Pavements in Alabama
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2023-04-30
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[PDF-6.43 MB]
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Edition:From 4-30-2021 to 4-30-2023
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Abstract:Permit regulations and heavy traffic monitoring procedures are developed to provide safety and protect the infrastructure from accelerated wear and tear. The number of issued permits is growing, but the impact of the overloaded vehicles has not been quantified. Alabama permit fee schedule has not been changed for decades; therefore, there is a need to evaluate the permit traffic-induced load effects. Thus, the objectives of this project are to assess the damage to bridges and pavements caused by permitted overweight vehicles in Alabama, calculate the damage for various types of vehicles and permits, and provide a background for the selection of a rational and equitable permit fee schedule. This project used ALDOT permit data for the years 2013-2021 to assess the damage. The study developed Alabama Transport Demand Model to identify heavy permit corridors and determine the types of bridges and roads utilized by the overloaded permit traffic. Over 160,000 permit trucks were considered. These permit trucks were run over 750,000 road links, and 195,000 bridges to determine the bridge and pavement damage. The damage analysis served as a basis for the development of new permit fee schedule scenarios. Four permit scenarios are presented for consideration. The permit fee is based on the calculated damage and depends on: (1) Gross Vehicle Weight (GVW) and number of trips, (2) GVW, number of trips, and number of axles, (3) GVW, number of trips and trip distance, and (4) GVW, number of trips, number of axles and trip distance. For the number of trips, the considered options include a single trip or multiple trip permits for 1, 3, 6, and 12 months. The permit fees were developed for GVW from 80,000 lbs to 200,000 lbs and vehicles with less than 6, 6, 7, and more than 7 axles. To calculate the actual permit fee, a Permit Fee Calculator was developed, and it is available in the form of an interactive spreadsheet attached to this report.
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