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40,000 pounds gross weight on a 2-axle vehicle; 54,000 pounds gross weight on a 3-axle vehicle; and (ii) a truck when in combination with a trailer 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; 90,000 pounds gross weight on a 5-axle or 6-axle vehicle. Vehicles operating under this paragraph (13) are not subject to the bridge formula. (14) A vehicle or combination of vehicles that uses natural gas or propane gas as a motor fuel may exceed the above weight limitations by up to 2,000 pounds, the total allowance is calculated by an amount that is equal to the difference between the weight of the vehicle attributable to the natural gas or propane gas tank and fueling system carried by the vehicle, and the weight of a comparable diesel tank and fueling system. This paragraph (14) shall not allow a vehicle to exceed any posted weight limit on a highway or structure. (15) An emergency vehicle or fire apparatus that is a vehicle designed to be used under emergency conditions to transport personnel and equipment, and used to support the SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468