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Office of the Secretary (OST)

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)

Office of the Assistant Secretary for Research and Technology

Pipeline and Hazardous Materials Safety Administration (PHMSA)

Great Lakes St. Lawrence Seaway Development Corporation (GLS)

U.S. DOT Volpe Center

Build America Bureau

Office of Multimodal Freight Infrastructure and Policy