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2-axle motor vehicle operating over any street of the city exceed 40,000 pounds. (4) Weight limitations shall not apply to vehicles (including loads) operated by a public utility when transporting equipment required for emergency repair of public utility facilities or properties or water wells. (4.5) A 3-axle or 4-axle vehicle (including when laden) operated or hired by a municipality within Cook, Lake, McHenry, Kane, DuPage, or Will county being operated for the purpose of performing emergency sewer repair that would be subject to a weight limitation less than 66,000 pounds under the formula in this subsection (a) shall have a weight limitation of 66,000 pounds or the vehicle's gross vehicle weight rating, whichever is less. This paragraph (4.5) does not apply to vehicles being operated on the National System of Interstate and Defense Highways, or to vehicles being operated on bridges or other elevated structures constituting a part of a highway. (5) Two consecutive sets of tandem axles may carry a total weight of 34,000 pounds each if the overall distance between the first and last axles of the consecutive sets of tandem axles is 36 feet or more, notwithstanding the lower limit resulting from the application of the above formula. (6) A truck, not in combination and used exclusively for the collection of rendering materials, may, when SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468