The U.S. Department of Transportation (DOT) is a federal agency responsible for overseeing the nation's transportation systems. Established in 1966, its mission is to ensure safe, efficient, and accessible transportation for all Americans. The DOT manages various modes of transport, including air, rail, road, and maritime. The department is composed of several agencies, such as the Federal Aviation Administration (FAA) and the Federal Highway Administration (FHWA). These agencies work together to develop policies, allocate funding, and enforce regulations that improve transportation infrastructure and safety across the country.