Media Advisory: Truck Size and Weight Limits Research Planning – New Interim Letter Report

In 2016, the U.S. Department of Transportation delivered the final report of its Comprehensive Truck Size and Weight Limits Study.  The report refrained from recommending changes in federal truck size and weight regulations because of limitations in the data needed to understand the impacts of heavier and larger trucks on the U.S. transportation system. To overcome these data limitations, the National Academies of Sciences, Engineering, and Medicine were asked to recommend a research plan to reduce uncertainties in estimates of the impacts of changes in truck size and weight limits.

A new interim letter report summarizes the recommendations of past truck size and weight limit studies, proposes candidates for research topics, and offers methods to evaluate alternative truck size and weight regulatory structures.  In addition, the report identifies criteria that will be taken into account when deciding the priority of topics to be included in the requested research plan, which will be presented in a final report expected this fall.

Advance copies of Truck Size and Weight Limits Research Planning: Letter Report I will be available to reporters only beginning at 2 p.m. EDT on Friday, April 13. The report is embargoed and not for public release before 11 a.m. EDT on Monday, April 16. To obtain a copy, reporters should contact the Office of News and Public Information at tel. 202-334-2138 or email