In 1967, control over interstate motor safety was transferred to which newly created department?

The U.S. Department of Transportation was established in 1966 and became the central authoritative body responsible for regulating all modes of transportation, including interstate motor safety. This transfer of control in 1967 marked a significant step in the federal government's commitment to improving safety standards and regulations across the transportation sector.

The establishment of the Department facilitated better oversight and a more coordinated approach to traffic safety, air travel, railroad issues, and shipping. This comprehensive scope of authority is what makes the U.S. Department of Transportation the correct answer.

The other options represent different entities within the broader structure of transport safety and regulation. The Federal Highway Administration focuses specifically on highway infrastructure, while the National Highway Traffic Safety Administration is tasked mainly with improving road safety standards and crash investigation. The Federal Motor Carrier Safety Administration is responsible for regulating the trucking industry, but all of these agencies work under the umbrella of the U.S. Department of Transportation, which retains the overarching authority for interstate motor safety.