NOTE: "Trucks" represents all types of trucks, including light trucks (sport utility vehicles, vans, and pick-up trucks).
SOURCES: Except as noted-U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2002 (Washington, DC: 2002), table 1-25, also available at http://www.bts.gov/, as of April 2003. 2001 and 2002-R.L. Polk & Co., "Median Age of U.S. Cars and Light Trucks Increases According to R.L. Polk & Co.," press release, February 11, 2003.