(Commodity Flow Survey Data Only)
|Under 250 miles||250 miles or more|
NOTE: Shipments are grouped into distance categories based on Great Circle Distance (GCD), GCD is the shortest distance between 2 points on the surface of a sphere.
Ton-miles estimates are based on estimated distances traveled along a modeled transportation network.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, based on data from the 1993 and 2002 Commodity Flow Survey, December 2004.