MAP-21 Comprehensive Truck Size and Weight Limits Study
Provisions in MAP-21, the Moving Ahead for Progress in the 21st Century Act (P.L. 112-141), require the USDOT to conduct a Comprehensive Truck Size and Weight Limits Study (MAP-21 §32801) addressing differences in safety risks, infrastructure impacts, and the effect on levels of enforcement between trucks operating at or within federal truck size and weight (TSW) limits and trucks legally operating in excess of federal limits; comparing and contrasting the potential safety and infrastructure impacts of alternative configurations (including configurations that exceed current federal TSW limits) to the current Federal TSW law and regulations; and, estimating the effects of freight diversion due to these alternative configurations.
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United States Department of Transportation - Federal Highway Administration