46,567 miles of Interstate highways
113,983 miles of other National Highway System (NHS) roads
3,771,462 miles of non-NHS roads
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
4,000 private motorcoach companies operating in the U.S. and Canada, 860 million passengers1
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.