Table 1,
The Transportation Network: 2004,
Mode,Components
Highway,Public roads
,"46,837 miles of Interstate highway"
,"115,319 miles of other National Highway System roads"
,"3,835,305 miles of other roads"
Air,Public-use airports
,"5,288 airports"
,Airports serving large certificated carriers 
,"27 large hub areasa (70 airports), 467 million enplaned passengers"
,"35 medium hub areas (58 airports), 127 million enplaned passengers "
,"68 small hub areas (83 airports), 53 million enplaned passengers"
,"970 nonhub areas (1,009 airports), 22 million enplaned passengers"
Rail,Miles of railroad operated
,"97,496 miles by Class I freight railroads in the United Statesb"
,"15,641 miles by regional freight railroads"
,"27,109 miles by local freight railroads"
,"23,000 miles by Amtrak (passenger)c"
Urban transit (2003),Directional route-milesd 
,"Bus: 165,854e"
,Trolley bus: 425 
,"Commuter rail: 4,407"
,"Heavy rail: 1,597"
,"Light rail: 1,097"
,Stations 
,"Commuter rail: 1,153"
,"Heavy rail: 1,023"
,Light rail: 723
Water,"26,000 miles of navigable channels (2003)"
,Ferry routes: 487 (2000)
,Commercial waterway facilitiesa (2003)
,Great Lakes: 600 deep-draft
,Great Lakes: 154 shallow-draft
,"Inland: 2,361 shallow-draft"
,"Ocean: 4,287 deep-draft"
,"Ocean: 1,770 shallow-draft"
,Locks: 257
Pipeline,Oil
,"Crude lines: 65,942 miles of pipe "
,"Product lines: 76,258 miles of pipe "
,Gas (2003)
,"Transmission: 304,000 miles of pipe "
,"Distribution: 1,097,900 miles of pipe  "
"a See Glossary for definitions.   b There are also 560 miles of railroad operated within the U.S. Class I freight railroad system that are owned by Canada.   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, RITA, BTS, National Transportation Statistics, available at http://www.bts.gov; Association of American Railroads, Railroad Facts, 2005 (Washington, DC: 2005); USDOT, FHWA, Highway Statistics 2004 (Washington, DC: 2005), table HM-18; Oil & Gas Journal, Sept. 12, 2005; USDOT, Federal Transit Administration, 2003 National Transit Summaries and Trends, tables 21, 23, 24, and appendix, available at www.ntdprogram.com; USDOT, RITA, BTS, “Airport Activity Statistics of Certificated Air Carriers, Summary Tables, 12 Months Ending Dec. 31, 2004,” 2005; U.S. Army Corps of Engineers, Institute for Water Resources, Navigation Data Center, The U.S. Waterway System Facts, December 2004 (Alexandria, VA: 2004).",
,