NOTES: Maintenance includes any work required to keep highways in usable condition that does not
extend the service life of the roadway beyond the original design. Restoration includes renovation.
Although the following categories are not generally considered maintenance, they are included for
comparison: major widening, relocation, and new route.
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics
2001 (Washington, DC: 2002), “Miles of Federal-Aid Roadway Projects Underway by Improvement
Type” chart, also available at http://www.fhwa.dot.gov/ohim, as of June 2003.
