105 STAT. 1954 PUBLIC LAW 102-240—DEC. 18, 1991 publication under subparagraph (D) to reflect the determination of the Secretary. " (4) LONGER COMBINATION VEHICLE DEFINED.— For purposes of this section, the term 'longer combination vehicle' means any combination of a truck tractor and 2 or more trailers or semitrailers which operates on the Interstate System at a gross vehicle weight greater than 80,000 pounds. "(5) REGULATIONS REGARDING MINOR ADJUSTMENTS. — Not later than 180 days after the date of the enactment of this subsection, the Secretary shall issue regulations establishing criteria for the States to follow in making minor adjustments under paragraph (I)(B).". 23 USC 141. (c) STATE CERTIFICATION.—Section 14103) of such title is amended by adding at the end the following new sentence: "Each State shall also certify that it is enforcing and complying with the provisions of section 127(d) of this title and section 411(j) of the Surface Transportation Assistance Act of 1982 (49 U.S.C. App. 23110)).". (d) INTERSTATE ROUTE 68. —Section 127 of such title is amended by adding at the end the following new subsection: " (e) OPERATION OF CERTAIN SPECIALIZED HAUUNG VEHICLES ON INTERSTATE ROUTE 68.—The single axle, tandem axle, and bridge formula limits set forth in subsection (a) shall not apply to the operation on Interstate Route 68 in Garrett and Allegany Counties, Maryland, of any specialized vehicle equipped with a steering axle and a tridem axle and used for hauling coal, logs, and pulpwood if such vehicle is of a type of vehicle as was operating in such counties on United States Route 40 or 48 for such purpose on August 1, 1991.". 23 USC 127 note. (e) FiREFIGHTING VEHICLES.— (1) TEMPORARY EXEMPTION.— The second sentence of section 127 of title 23, United States Code, relating to axle weight limitations and the bridge formula for vehicles using the National System of Interstate and Defense Highways, shall not apply, in the 2-year period beginning on the date of the enactment of this Act, to any existing vehicle which is used for the purpose of protecting persons and property from fires and other disasters that threaten public safety and which is in actual operation before such date of enactment and to any new vehicle to be used for such purpose while such vehicle is being delivered to a firefighting agency. The Secretary may extend such 2-year period for an additional year. (2) STUDY.— The Secretary shall conduct a study— (A) of State laws regulating the use on the National System of Interstate and Defense Highways of vehicles which are used for the purpose of protecting persons and property from fires and other disasters that threaten public safety and which are being delivered to or operated by a firefighting agency; and (B) of the issuance of permits by States which exempt such vehicles from the requirements of the second sentence of section 127 of title 23, United States Code. (3) PURPOSES.— The purposes of the study under this subsection are to determine whether or not such State laws and such section 127 need to be modified with regard to such vehicles and whether or not a permanent exemption should be made for such vehicles from the requirements of such laws and section 127 or
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