Freight Activity in the United States: 1993, 1997, 2002, 2007, 2012 and 2017
KEY: R = revised; S = data are not published because of high sampling variability or other reasons; U = data are not available.
a Truck as a single mode includes shipments that went by private truck only, for-hire truck only, or a combination of both.
b 1993 and 1997 data exclude most shipments of crude oil. 2002 and 2007 data exclude shipments of crude petroleum.
c Ton-miles estimates are based on estimated distances traveled along a modeled transportation network.
d Percent change has been revised in...