Table 1
Highways: 1999 Data (unless noted)

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Public roads

46,567 miles of Interstate highways

113,983 miles of other National Highway System (NHS) roads

3,771,462 miles of non-NHS roads

Vehicles and use

132 million cars, driven 1.6 trillion miles

75 million light trucks, driven 0.9 trillion miles

7.8 million commercial trucks with 6 tires or more and combination trucks, driven 0.2 trillion miles

729,000 buses (all types), driven 7.7 billion miles

4.2 million motorcycles, driven 10.6 billion miles

Passenger and freight motor carriers

4,000 private motorcoach companies operating in the U.S. and Canada, 860 million passengers¹

511,000 interstate freight motor carriers² (2000), 1.1 trillion ton-miles carried³

¹ American Bus Association, available at http://www.buses.org, as of Nov. 9, 2000.
² U.S. Department of Transportation, Federal Motor Carrier Safety Administration, Motor Carrier Management Safety Information System Report LS50B901 (Washington, DC: March 2000).
³ Eno Foundation, Inc., Transportation in America, 1999 (Washington, DC: 2000).

SOURCE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics 1999 (Washington, DC: 2000), tables HM-14 and HM-20.