LAW states registration not required

[Treefarmer]

AFAIK State DMVs are subject to US Department of Transportation regulations, etc. US Department of Transportation a superior venue to the State DMV. Totally different jurisdiction and venue. If you are not commercial, private, not for hire I am unaware of any driver license requirement.

I just went to the DOT website.
Curiously they don't say much about themselves and don't even specify which United States they serve.
But they appear to be in charge of a whole host of alphabet agencies.

[allodial]

I just went to the DOT website.
Curiously they don't say much about themselves and don't even specify which United States they serve.
But they appear to be in charge of a whole host of alphabet agencies.

U.S. Department of Transportation works with US Coast Guard and is under the U.S.' Secretary of Transportation. USDOT is over both the FAA and the TSA. The office of the U.S.' Secretary of Transportation is a 'cabinet position' along with the U.S. Postmaster General.

The United States Secretary of Transportation is the head of the United States Department of Transportation, a member of the President's Cabinet, and fourteenth in the Presidential line of succession.[1] The post was created with the formation of the Department of Transportation on October 15, 1966, by President Lyndon B. Johnson's signing of the Department of Transportation Act.[2] The Department's mission is "to develop and coordinate policies that will provide an efficient and economical national transportation system, with due regard for need, the environment, and the national defense."[2] The Secretary of Transportation oversees eleven agencies, including the Federal Aviation Administration, the Federal Highway Administration, and the National Highway Traffic Safety Administration.[2] In April 2008, Mary Peters launched the official blog of the Secretary of Transportation called The Fast Lane.[3] (Wikipedia)

But they appear to be in charge of a whole host of alphabet agencies.

Thusly, the USDOT # is issued by the organization that run the FAA and apparently used to run the TSA until March 25, 2003. Apparently the U.S. Coast Guard was transferred to the US Department of Transportation in 1967 and to the DHS in 2003.

[Treefarmer]

DOT website says:

"Coast Guard and Transportation Security Agency have transferred to the Department of Homeland Security. Older press releases may be found by searching the archives. "