49 CFR §555.4

Administrator means the National Highway Traffic Safety Administrator or his delegate. Passenger motor vehicle means a motor vehicle with motive power designed to carry not more than 12 individuals, but does not include a truck not designed primarily to carry its operator or passengers, or a motorcycle. United States means the several States, the District of Columbia, the Commonwealth of Puerto Rico, Guam, the Virgin Islands, the Canal Zone, and American Samoa.