This report which was prepared from a review of literature, contains information on the principal factors involved in the construction, operation and maintenance of the highway system that are related to vehicle weights and dimensions, as well as presents an analysis of these factors for their impacts on benefits and disbenefits to highway users and non-users. Methods have been assembled from the state of the art that permit projection of estimated use of highway facilities by various classes of commercial vehicles, the division of motor freight among vehicle classes on principal types of highways, and estimated payloads these vehicles will transport. Details are given of two separate estimates that are proposed.