1-1,,
The Transportation Network: 2006,,
Mode,Components,
Highway,Public roads,
,"46,893 miles of Interstate highway",
,"116,573 miles of other National Highway System roads",
,"3,869,541 miles of other roads",
Air,Public-use airports,
,"5,233 airports",
,Airports serving large certificated carriers (enplaned passengers),
,"26 large hub areasa (67 airports), 487 million passengers",
,"37 medium hub areas (62 airports), 141 million passengers",
,"67 small hub areas (83 airports), 53 million passengers",
,"924 nonhub areas (959 airports), 23 million passengers",
Rail,Miles of railroad operated,
(2007),"94,313 miles by Class I freight railroads in the United Statesb",
,"16,930 miles by regional freight railroads",
,"28,891 miles by local freight railroads",
,"21,708 miles by Amtrak (passenger)c",
Urban transit,Directional route-milesd ,
,"Bus: 168,255e",
,Trolley bus: 424,
,"Commuter rail: 4,490",
,"Heavy rail: 1,603",
,"Light rail: 1,178",
,Stations ,
,"Commuter rail: 1,169",
,"Heavy rail: 1,042",
,Light rail: 764,
Water,"Navigable channels: 26,000 miles",
,Ferry routes: 620 directional route-miles,
(2007),Commercial waterway facilitiesa,
,"Great Lakes: 600 deep-draft, 154 shallow-draft",
,"Inland: 2,321 shallow-draft",
,"Ocean: 4,466 deep-draft, 2,043 shallow-draft",
,Locks: 257,
Pipeline,Miles of oil pipe,
,"Total oil: 169,346",
,Miles of gas pipe,
,"Transmission: 300,400",
,"Distribution: 1,214,000",
"a See Glossary for definitions. b There are also 561 miles of railroad operated within the U.S. Class I freight railroad system that are owned by Canadian railroads. c Approximately 97% of the trackage on which Amtrak operates is owned by freight railroads. d Directional route-miles includes only 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: Highway: USDOT, FHWA, Highway Statistics 2006 (Washington, DC: 2008), table HM-18. Air: USDOT, RITA, BTS, Airport Activity Statistics of Certificated Air Carriers, Summary Tables, 12 Months Ending Dec. 31, 2006. Rail: Association of American Railroads, Railroad Facts 2008. Transit: USDOT, Federal Transit Administration, National Transit Database 2006, tables 21, 23, and 24. Commercial waterway facilities: U.S. Army Corps of Engineers, Institute for Water Resources, Navigation Data Center, The U.S. Waterway System Facts, December 2007 (Alexandria, VA: 2007). Navigable channels: U.S. Army Corps of Engineers, Pipeline: PHMSA as cited in USDOT, RITA, BTS, National Transportation Statistics, tables 1-1, 1-3, and 1-10, available at http://www.bts.gov as of November 2008.   ",,