Department of Transportation (DOT)

Federal Aviation Administration (FAA)
Federal Highway Administration (FHWA)
Federal Motor Carrier Safety Administration (FMCSA)
Federal Railroad Administration (FRA)
Federal Transit Administration (FTA)
Maritime Administration (MARAD)
National Highway Traffic Safety Administration (NHTSA)
Pipeline and Hazardous Materials Safety Administration (PHMSA)
Saint Lawrence Seaway Development Corporation (SLSDC)
Surface Transportation Board (STB)
Office of Inspector General (OIG)