; (2) by redesignating paragraphs (2) through (5) as paragraphs (3) through (6) respectively; (3) by inserting after paragraph (1) the following: (2) Additional limitation (A) In general A State, political subdivision of a State, or political authority of 2 or more States may not enact or enforce a law, regulation, or other provision having the force and effect of law prohibiting employees whose hours of service are subject to regulation by the Secretary under section 31502 from working to the full extent permitted or at such times as permitted under such section, or imposing any additional obligations on motor carriers if such employees work to the full extent or at such times as permitted under such section, including any related activities regulated under part 395 of title 49, Code of Federal Regulations. (B) Statutory construction Nothing in this paragraph shall be construed to limit the provisions of paragraph (1). . (4) in paragraph (3) (as redesignated) by striking Paragraph (1)— and inserting Paragraphs (1) and (2)— ; and (5) in paragraph (4)(A) (as redesignated) by striking Paragraph (1) and inserting Paragraphs (1) and (2) . (b) Effective Date The amendments made by this section shall have the force and effect as if enacted on the date of enactment of the Federal Aviation Administration Authorization Act of 1994 ( Public Law 103–305 ). 134. Section 31112(c) of title 49, United States Code, is amended— (1) in the subsection heading by striking and Kansas and inserting Kansas, and Oregon ; (2) in paragraph (4) by striking and at the end; (3) in paragraph (5) by striking the period at the end and inserting ; and ; and (4) by adding at the end the following: (6) Oregon may allow the operation of a truck tractor and 2 property-carrying units not in actual lawful operation on a regular or periodic basis on June 1, 1991, if— (A) the length of the property-carrying units does not exceed 82 feet 8 inches; (B) the combination is used only to transport sugar beets