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U.S. Department of Transportation. Research and Innovative Technology Administration (RITA) - United States Department of Transportation (USDOT, US DOT or DOT) PHMSA - Home. Federal Motor Carrier Safety Administration. FAA: Home. Federal Highway Administration. Home. The Federal Transit Administration. Seaway System — Réseau de la Voie maritime. U.S. Department of Transportation. Maritime Administration Home Page. National Highway Traffic Safety Administration (NHTSA)