Trucking is a vital segment of the transportation system in the United States.
This report presents new estimates of the movements of commodities by truck to, from, within, and through each state. These estimates show the magnitude of interstate commerce on the nation's highways, particularly on the traffic that travels through states. Figure 1 and table 1 show the value of truck shipments and indicate the relative importance of trucking to each state. Figure 2 and table 2 show the ton-miles of truck shipments and indicate the amount of trucking activity over the highways. Ton-miles of each interstate shipment are divided among the states in proportion to the distance along the route used by the shipment, while the value of the interstate shipment is counted in each state in which the shipment passes.