Table 1,
The Transportation Network: 2003,
Mode,Components
Highway,Public roads
,"46,769 miles of Interstate highway"
,"115,032 miles of other National Highway System roads"
,"3,828,046 miles of other roads"
Air,Public-use airports
,"5,286 airports"
,Airports serving large certificated carriers (2002)
,"29 large hub areasa (72 airports), 443 million enplaned passengers"
,"33 medium hub areas (38 airports), 103 million enplaned passengers "
,"63 small hub areas (71 airports), 43 million enplaned passengers"
,"651 nonhub areas (664 airports), 16 million enplaned passengers"
Rail,Miles of railroad operated
,"98,944 miles by Class I freight railroads in the United Statesb"
,"15,648 miles by regional freight railroads"
,"26,347 miles by local freight railroads"
,"23,000 miles by Amtrak (passenger)c"
Urban transit 2002,Directional route-milesd 
,"Bus: 185,216e"
,Trolley bus: 468 
,"Commuter rail: 4,440"
,"Heavy rail: 1,572"
,Light rail: 943
,Stations 
,Commuter rail: 919
,Heavy rail: 994
,Light rail: 625
Water,"26,000 miles of navigable waterways (2002)"
,Ferry routes: 487 (2000)
,Commercial waterway facilitiesa (2002)
,Great Lakes: 600 deep-draft
,Great Lakes: 154 shallow-draft
,"Inland: 2,361 shallow-draft"
,"Ocean: 4,284 deep-draft"
,"Ocean: 1,765 shallow-draft"
,Locks: 275
Pipeline,Oil
,"Crude lines: 64,336 miles of pipe "
,"Product lines: 75,565 miles of pipe "
,Gas (2002)
,"Transmission: 309,503 miles of pipe "
,"Distribution: 1,079,565 miles of pipe  "
a See Glossary for definitions.   b There are also 570 miles of railroad operated by U.S. Class I freight railroads in Canada and Mexico.  ,
"c The Amtrak mileage includes the 745 miles of trackage it owns and route-miles operated on the tracks of the freight railroads.   d Directly operated service. Does not include contracted service.   e Includes directional route-miles on exclusive right-of-way, controlled right-of-way, and mixed traffic.",
"Sources: Various sources, as cited in USDOT, Bureau of Transportation Statistics (BTS), National Transportation Statistics, available at http:// www.bts.gov; Association of American Railroads, Railroad Facts, 2003 (Washington, DC: 2004); USDOT, Federal Highway Administration, Highway Statistics 2003 (Washington, DC: 2004), table HM-18; Oil & Gas Journal, Aug. 23, 2004; USDOT, Federal Transit Administration, 2002 National Transit Summaries and Trends, table 18 and appendix, available at www.ntdprogram.com; USDOT, BTS, “Airport Activity Statistics of Certificated Air Carriers, Summary Tables, 12 Months Ending Dec. 31, 2002,” 2004; U.S. Army Corps of Engineers, Institute for Water Resources, Navigation Data Center, The U.S. Waterway System Facts, December 2003 (Alexandria, VA: 2003).",