Author/Creator
- United States118
- United States. Federal Highway Administration78
- United States. Congress. House. Committee on Transportation and Infrastructure67
- United States. Department of Transportation59
- United States. Congress. House. Committee on Interstate and Foreign Commerce42
- United States. Bureau of the Census41
- United States. Government Accountability Office40
- United States. Federal Highway Administration, issuing body33
- United States. Congress. Senate. Committee on Environment and Public Works, author32
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Highways and Transit31
- United States. General Accounting Office28
- Association of American Railroads23
- United States. Congressional Budget Office21
- United States. Department of Transportation. Office of the Secretary19
- United States. Federal Transit Administration19
- United States. Bureau of Transportation Statistics18
- United States. Congress. Senate. Committee on Commerce, Science, and Transportation17
- National Research Council (U.S.). Transportation Research Board16
- United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Surface Transportation16
- United States. Congress. Senate. Committee on Interstate Commerce16