To amend title 23, United States Code, with respect to gross vehicle weights on the National System of Interstate and Defense Highways, and title 49, United States Code with respect to commercial motor vehicle combination lengths, on the National System of Interstate and Defense Highways and other highways, and for other purposes.

Amends Federal highway provisions to allow longer combination vehicles (LCVs) to continue to operate only if the Secretary of Transportation determines that such vehicles were authorized by State statute or regulation conforming to Federal law and were in actual, continuing lawful operation on June 1, 1991.

Specifies that: (1) all such operations shall continue to be subject to, at the minimum, all State statutes, regulations, limitations, and conditions, including routing-specific and configuration-specific designations and all other restrictions (statutes and restrictions), in force on June 1, 1991; and (2) nothing in this Act shall prevent any State from further restricting or prohibiting the operation of LCVs whose continued operation is authorized under such provisions, with exceptions.

Directs the Secretary, within 60 days, to publish in the Federal Register a complete list of such State statutes and restrictions, which shall become final 60 days after publication. Bars LCVs from operating except as provided in such list.

Sets forth analogous restrictions with respect to cargo carrying unit limitations under Federal transportation provisions.