Figure 2-2. Highway Vehicle-Miles of Travel by Vehicle Type: 2004

Despite doubling over the past two decades, truck traffic remains a relatively small share of highway traffic as a whole. In 2004, commercial trucks accounted for about 8 percent of highway vmt. Truck vmt is comprised of 64 percent combination truck and 36 percent single-unit truck.

Data represented in the figure
Table in Excel format | Historical data

Vehicle type	2004
Passenger car	1,704,982
Light trucks	1,014,342
Other	16,685
Truck, single-unit 2-axle 6-tire or more	81,107
Truck, combination	145,398

Note: “Other” comprises bus and motorcyle. Light trucks include sport utility vehicles, minivans, and pickup trucks.

Source: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual issues), table VM-1, available at www.fhwa.dot.gov/policy/ohpi/hss/index.htm as of Jan. 23, 2006.