Bridge Load Posting Based on Actual Arkansas Truck Traffic
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2018-08-01
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Edition:Final report, Sep 2016-Aug 2018
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Abstract:Bridge load posting limits are a safety and economic decision. Bridge load posting limits restrict truck traffic to ensure safety. Therefore, trucks that exceed bridge load posting limits are required to take alternate routes. The Arkansas Department of Transportation (ARDOT) uses a family of CMV (commercial motor vehicle) configurations and loadings with the designations ‘CODE 4’, ‘CODE 9’, and ‘CODE 5’ as their weight limit posting vehicles. These trucks are used to represent trucks using Arkansas bridges. These truck configurations were initially considered in the 1980’s. Since then, truck configurations and axle loadings have significantly changed. Therefore, currently used ARDOT load posting truck configurations and weights may be outdated and may not be representative of critical truck loads actually supported by Arkansas bridges. Consequently, there is a need to correctly identify Arkansas truck traffic weights and configurations so that ARDOT bridge engineers can accurately assess bridge weight limit values for bridge posting.
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