The U.S. Department of Transportation (USDOT) works to keep the traveling public safe and secure, increases their mobility, and helps the transportation system contribute to the nation's economic growth. In addition to the Office of the Secretary of Transportation (OST), there are numerous operating administrations and bureaus, each with its own management and organizational structure . Selected agencies are listed below.
The Transportation Research Board (TRB) provides leadership in transportation improvements and innovation through trusted, timely, impartial, and evidence-based information exchange, research, and advice regarding all modes of transportation. Key research programs are listed below.