1-1,
The Transportation Network: 2005,
Mode,Components
Highway,Public roads
,"46,873 miles of Interstate highway"
,"115,500 miles of other National Highway System roads"
,"3,849,259 miles of other roads"
Air,Public-use airports
,"5,270 airports"
,Airports serving large certificated ­carriers 
,"26 large hub areasa (69 airports), 484 million enplaned passengers"
,"37 medium hub areas (60 airports), 141 million enplaned passengers "
,"66 small hub areas (82 airports), 53 million enplaned ­passengers"
,"930 nonhub areas (968 airports), 23 million enplaned ­passengers"
Rail,Miles of railroad operated
,"95,664 miles by Class I freight railroads in the United Statesb"
,"15,388 miles by regional freight railroads"
,"29,197 miles by local freight railroads"
,"23,000 miles by Amtrak (passenger)c (2004)"
Urban transit (2004),Directional route-milesd 
,"Bus: 165,854e"
,Trolley bus: 425 
,"Commuter rail: 4,407"
,"Heavy rail: 1,596"
,"Light rail: 1,097"
,Stations 
,"Commuter rail: 1,153"
,"Heavy rail: 1,023"
,Light rail: 723
Water,"Navigable channels: 26,000 miles (2003)"
,Ferry routesf: 623 directional route miles (2004)
,Commercial waterway facilitiesa (2004)
,Great Lakes: 600 deep-draft
,Great Lakes: 154 shallow-draft
,"Inland: 2,320 shallow-draft"
,"Ocean: 4,298 deep-draft"
,"Ocean: 1,761 shallow-draft"
,Locks: 257
Pipeline,Oil
,"Crude lines: 60,043 miles of pipe "
,"Product lines: 71,310 miles of pipe "
,Gas (2004)
,"Transmission: 298,900 miles of pipe "
,"Distribution: 1,139,800 miles of pipe  "
a See Glossary for definitions.   ,
"b There are also 1,368 miles of railroad operated within the U.S. Class I freight railroad system that are owned by Canadian railroads.",
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, 2006 (Washington, DC: 2006); USDOT, Federal Highway Administration, Highway Statistics 2005 (Washington, DC: 2006), table HM-18; Oil & Gas Journal, Sept. 11, 2006; USDOT, Federal Transit Administration, 2004 National Transit Summaries and Trends, tables 21, 23, and 24, available at http://www.ntdprogram.com/ntdprogram/pubs.htm; USDOT, RITA, BTS, “Airport Activity Statistics of Certificated Air Carriers, Summary Tables, 12 Months Ending Dec. 31, 2005,” 2005; U.S. Army Corps of Engineers, Institute for Water Resources, Navigation Data Center, The U.S. Waterway System Facts, December 2005 (Alexandria, VA: 2005).",