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Table 1
Highways: 2000 Data (unless noted)

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Public roads 

46,677 miles of Interstate highways 
114,511 miles of other National Highway System (NHS) roads
3,789,927 miles of non-NHS roads

Vehicles and use 

134 million cars, driven 1.6 trillion miles 
79 million light trucks, driven 0.9 trillion miles
8 million commercial trucks with 6 tires or more and combination trucks, driven 0.2 trillion miles
746,000 buses (all types), driven 7.6 billion miles
4.3 million motorcycles, driven 10.5 billion miles

Passenger and freight motor carriers

4,000 private motorcoach companies operating in the U.S. and Canada (1999), 860 million passengers¹  (1999)
511,000 interstate freight motor carriers,² 
1.1 trillion ton-miles carried³ 

¹ American Bus Association, Motorcoach Census 2000, available at http://www.buses.org, as of Mar. 27, 2002.

² U.S. Department of Transportation, Federal Motor Carrier Safety Administration, analysis and information online, “SafeStat Online,” available at http://ai.volpe.dot.gov/SafeStat/safestatmain.asp, as of September 2001.

³ Eno Foundation, Inc., Transportation in America, 2000 (Washington, DC: 2001).

SOURCE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics 2000 (Washington, DC: 2001), tables HM-15 and VM-1, also available at http://www.fhwa.dot.gov/ohim/hs00/index.htm, as of Mar. 26, 2002.