1 Includes vans, light trucks, and sport utility vehicles.
2 Includes all single-unit trucks with at least 2 axles and 6 tires.
KEY: P = preliminary.
SOURCES: 1987-95: U.S. Department of Transportation, Federal Highway Administration. Highway Statistics Summary to 1995 (Washington, DC: 1997), table MV-201 and VM201a.
1996-1997: _____. Highway Statistics 1997 (Washington, DC: 1999),table VM-1.