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- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)4
- Federal Highway Administration (FHWA)2
- United States. Bureau of Transportation Statistics2
- Federal Transit Administration (FTA)1
- National Renewable Energy Laboratory1
- United States. Army. Corps of Engineers.1
- United States. Department of Transportation. Research and Innovative Technology Administration1
- United States. Federal Aviation Administration1
- United States. Federal Transit Administration.1