Chapter I Pipeline and Hazardous Materials Safety Administration, Department of Transportation
Chapter II Federal Railroad Administration, Department of Transportation
Chapter III Federal Motor Carrier Safety Administration, Department of Transportation
Chapter IV Coast Guard, Department of Homeland Security
Chapter V National Highway Traffic Safety Administration, Department of Transportation
Chapter VI Federal Transit Administration, Department of Transportation
Chapter VII National Railroad Passenger Corporation (Amtrak)
Chapter VIII National Transportation Safety Board
Chapter X Surface Transportation Board
Chapter XII Transportation Security Administration, Department of Homeland Security