Transportation System Extent (2000 data unless otherwise noted)

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• Highway
  • Public Roads
    • 46,675 miles of Interstate highway
    • 114,505 miles of other National Highway System roads
    • 3,951,098 miles of other roads
  
  
• Air
  • Public-use airports
    • 5,317 airports
  • Airports serving large certificated carriers
    • 29 large hubs^a (72 airports), 479 million enplaned passengers
    • 31 medium hubs (53 airports), 102 million enplaned passengers
    • 54 small hubs (69 airports), 40 million enplaned passengers
    • 585 nonhubs (610 airports), 18 million enplaned passengers
  
  
• Rail
  • Miles of road operated
    • 120,986 miles by Class 1 freight railroads^b
    • 21,250 miles by regional freight railroads
    • 28,422 miles by local freight railroads
    • 22,741 miles by Amtrak (passenger), of which 750 miles are Amtrak owned
  
  
• Urban transit
  • Directional route-miles serviced (1998)
    • Bus: 157,823
    • Trolley bus: 424
    • Commuter rail: 5,172
    • Heavy rail: 1,527
    • Light rail: 676
  • Stations
    • Commuter rail: 972
    • Heavy rail: 987
    • Light rail: 555
  
  
• Water
  • 26,000 miles of navigable waterways
  • 276 locks
  • Ferry routes: 48
  • Commercial Facilities
    • Great Lakes:
      • 611 deep
      • 143 shallow
    • Inland:
      • 2,367 shallow
    • Coastal:
      • 4,079 deep
      • 2,109 shallow
  
  
• Pipeline (1999)
  • Oil
    • Crude lines: 88,000 miles of pipe
    • Product lines: 91,000 miles of pipe
  • Gas
    • Transmission: 254,000 miles of pipe
    • Distribution: 981,000 miles of pipe

^a As used here, a hub is defined as a geographic area based on the percentage of total enplaned passengers in that area. For example, a large hub is a geographical area serving 1 percent or more of all enplaned revenue passengers in U.S. certificated route carriers operating in U.S. areas. This definition should not be confused with airline usage of the term hub to describe "hub and spoke" route structures, or other definitions of hubs used by the Federal Aviation Administration focusing on traffic at individual airports.
^b Includes 574 miles of road operated by U.S. Class 1 freight railroads in Canada.

SOURCES: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics 2000 (Washington DC: 2001); USDOT, Federal Aviation Administration, Administator's Fact Book 2000 (Washington DC: 2001); USDOT, Bureau of Transportation Statistics, National Transportation Statistics 2000 (Washington DC: 2001), various tables; National Ferry Database, as of 10/10/00; and U.S. Army Corps of Engineers, Navigation Data Center, The U.S. Waterway System - Transportation Facts, December 2000.