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- United States. Bureau of Transportation Statistics[remove]23
- 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
- United States. Army. Corps of Engineers.2
- Federal Highway Administration1
- Research and Innovative Technology Administration's Bureau of Transportation Statistics1
- U.S. Customs and Border Protection1
- United States. Federal Aviation Administration.1
- United States. National Park Service.1