a Includes gas and liquid pipeline.
b General support represents administrative and operating expenditures of the U.S. Department of Transportation, the Interstate Commerce Commission, and the National Transportation Safety Board.
NOTES: Numbers may not add to totals due to rounding.
For 1985 through 1994, water and pipeline expenditures have been revised. Revisions in water data reflects a new approach instituted by the U.S. Army Corps of Engineers. Pipeline expenditure data has been revised due to inconsistencies found during a routine audit of the U.S. Bureau of Transportation Statistics database.
1980: U.S. Department of Transportation, Bureau of Transportation Statistics. Transportation Receipts and Outlays in the Federal Budget, Fiscal Years 1977-94 (Washington, DC: April 1997), table C-3.
1985-96: Ibid. Government Transportation Financial Statistics: Fiscal Years 1985-95, Internet site www.bts.gov, Appendix A, tables A-4, and Appendix B, tables B-5 through B-12.Constant dollar deflator: U.S. Department of Commerce, Bureau of Economic Analysis, Survey of Current Business (Washington, DC: June 2000), table 7-11, "Chain Type Price Indexes-Federal."