# U.S. DOT: Comprehensive Truck Size & Weight Limits Study

The Moving Ahead for Progress in the 21st Century Act required the U.S. Department of Transportation (U.S. DOT) to conduct a Comprehensive Truck Size and Weight Limits Study, which addressed 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.

The U.D. DOT found that data limitations are so profound that no changes in the relevant laws and regulations should e considered until the limitations are overcome.