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of vehicles; and (iv) does not engage in a tow exceeding 20 miles from the initial point of wreck or disablement. Any additional movement of the vehicles may occur only upon issuance of authorization for that movement under the provisions of Sections 15-301 through 15-318 of this Code. The towing vehicle, however, may tow any disabled vehicle to a point where repairs are actually to occur. This movement shall be valid only on State routes. The tower must abide by posted bridge weight limits. (12.5) The vehicle weight limitations in this Section do not apply to a covered heavy duty tow and recovery vehicle. The covered heavy duty tow and recovery vehicle license plate must cover the operating empty weight of the covered heavy duty tow and recovery vehicle only. (13) Upon and during a declaration of an emergency propane supply disaster by the Governor under Section 7 of the Illinois Emergency Management Agency Act: (i) a truck not in combination, equipped with a cargo tank, used exclusively for the transportation of propane or liquefied petroleum gas may, when laden, transmit upon the road surface, except when on part of the National System of Interstate and Defense Highways, the following maximum weights: 22,000 pounds on a single axle; 40,000 pounds on a tandem axle; SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468