|Oil and natural gas pipeline||843||19.4|
SOURCES: Air, oil pipeline, and water-U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), National Transportation Statistics 2002, table 1-44 revised, available at http://www.bts.gov/, as of October 2003. Truck, rail, natural gas pipeline-USDOT, BTS, calculations based on data from various sources as follows: Truck-USDOT, BTS, Transportation Statistics Annual Report 2000 (Washington, DC: 2001), p. 124, table 2; US International Trade and Freight Transportation Trends (Washington, DC: 2003), figure 14; USDOT, BTS, Martime Trade and Transportation 2002 (Washington, DC: 2002), table 1-20; and USDOT, Federal Highway Administration, Highway Statistics 2001 (Washington DC: 2002), table VM-1. Rail-Surface Transportation Board, Carload Waybill Sample; Transport Canada, Transportation in Canada, Addendum (Ottawa, Ontario: Annual issues), table A6-10; and Association of American Railroads, Railroad Facts (Washington, DC: 1991-2001 issues), p. 36.
Natural gas pipeline-U.S. Department of Energy (DOE), Energy Information Administration (EIA), Annual Energy Review 2001 (Washington, DC: 2002), table 6.5, and DOE, EIA, International Energy Annual 2001 (Washington, DC: 2003), table C-1.