NOTES: 2002 data are preliminary. Although final 2002 Commodity Flow Survey data were available when this report was prepared, final 2002 supplemental data were still forthcoming. For information on coverage of preliminary supplemental estimates, see table 1-12 in appendix B.
To eliminate the effects of inflation over time, the Bureau of Transportation Statistics converted current dollars to chained 2000 dollars.
SOURCES: Commodity Flow Survey data—U.S. Department of Transportation (USDOT), Research and Innovative Technology Administration, Bureau of Transportation Statistics (BTS) and U.S. Department of Commerce, U.S. Census Bureau, Commodity Flow Survey (Washington, DC: 2003). Supplemental estimates—USDOT, BTS, Freight Shipments in America (April 2004), available at http://www.bts.gov/, as of May 2005.