When fully licensed to a minimum gross weight of 72,000 pounds a three or more axle truck-tractor and a three or more axle dromedary truck-tractor, and a three or more axle truck when operating in combination with another vehicle or vehicles, the licensed gross weight of which, if any, shall be included when computing the minimum gross weights set forth above, shall be eligible under special permits to be issued by the State Highway Commission and/or the city licensing official to carry additional gross loads beyond the licensed capacity of the combination of vehicles upon the payment of a fee as described in RCW 46.44.095; provided, that the axle loads of such vehicle shall not exceed the limits specified in BCC 11.54.010 or the tire limits specified in BCC 11.54.090; provided further, that the gross weight of a three or more axle truck operating in combination with a two- or three-axle trailer shall not exceed 76,000 pounds, and the gross weight for a three or more axle truck-tractor operating in combination with a semitrailer shall not exceed 73,280 pounds, except where the semitrailer is eligible to carry a gross load of 36,000 pounds, pursuant to the provisions of BCC 11.54.010 through 11.54.060, in which event the maximum gross weight of the combination shall not exceed 76,000 pounds. The minimum additional tonnage to be purchased pursuant to this paragraph for a three or more axle tractor to be operated in combination with a semitrailer shall be not less than 1,280 pounds. The permits provided for in the two preceding paragraphs shall be known as class A additional tonnage permits. No class B permit shall be issued by the city, nor shall any vehicle be allowed to operate on the streets of the city under a class B permit. (Ord. 2005 § 8, 1974; 1961 code § 11.54.210.)