Portal:Department of Transportation/Section 1
- Advanced Research Projects Agency–Infrastructure (ARPA-I)
- Federal Aviation Administration (FAA)
- Federal Highway Administration (FHWA)
- Federal Motor Carrier Safety Administration (FMCSA)
- Federal Railroad Administration (FRA)
- Federal Transit Administration (FTA)
- Great Lakes St. Lawrence Seaway Development Corporation (GLS)
- Maritime Administration (MARAD)
- National Highway Traffic Safety Administration (NHTSA)
- Office of Inspector General (OIG)
- Office of the Secretary of Transportation (OST)
- Pipeline and Hazardous Materials Safety Administration (PHMSA)
- Research and Innovative Technology Administration，which includes the agencies below, among others：