SOURCE:
U.S. Department of Transportation, Bureau of Transportation Statistics:Estimates of vehicle-miles traveled calculated from data in U.S. Department of Transportation,Federal Highway Administration, Highway Statistics (Washington, DC: 1984–1998).Estimates of transportation expenditures calculated from data in U.S. Department of Labor, Bureau of Labor Statistics, “Consumer Expenditure Survey,” 1984–1998, available at http://www.bls.gov, as of May 2001.
