Task 51, FY 1992, "Synthesis of the Impacts of Truck Size and Weight on the Transportation System and the Economy" (Ms. Barbara T. Harder). Much research has been undertaken on the relationship between truck size and weight and the impacts on the transportation system and the economy. However, there is no one document that integrates all of the research findings in an easily understandable format. This synthesis has done just that. The synthesis provides a review of the literature and an overview of the research findings on critical topics in the area of truck size and weight as they relate to the transportation system and the economy. This synthesis is a valuable source document for the AASHTO Joint Committee on Domestic Freight Policy.