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Author
- United States. Bureau of Transportation Statistics23
- TomTom North America, Inc.16
- Environmental Systems Research Institute (Redlands, Calif.)15
- United States. Environmental Protection Agency.8
- United States. Department of Transportation. Research and Innovative Technology Administration6
- United States. Federal Highway Administration.5
- United States. Bureau of the Census.3
- Economic and Social Research Institute (Reston, Va.)2
- United States. Army. Corps of Engineers.2
- Federal Highway Administration1
- Research and Innovative Technology Administration's Bureau of Transportation Statistics1
- U.S. Census Bureau, Geography Division1
- U.S. Customs and Border Protection1
- United States. Federal Aviation Administration1
- United States. Federal Aviation Administration.1
- United States. National Park Service.1