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exceed the weight in the table in this subsection (a) for 6 axles measured between the extreme axles of the combination. Local authorities, with respect to streets and highways under their jurisdiction, without additional fees, may also by ordinance or resolution allow the weight limitations of this subsection, provided the maximum gross weight on any one axle shall not exceed 20,000 pounds and the maximum total weight on any tandem axle shall not exceed 34,000 pounds, on designated highways when appropriate regulatory signs giving notice are erected upon the street or highway or portion of any street or highway affected by the ordinance or resolution. The following are exceptions to the above formula: (1) Vehicles for which a different limit is established and posted in accordance with Section 15-316 of this Code. (2) Vehicles for which the Department of Transportation and local authorities issue overweight permits under authority of Section 15-301 of this Code. These vehicles are not subject to the bridge formula. (3) Cities having a population of more than 50,000 may permit by ordinance axle loads on 2-axle motor vehicles 33 1/2% above those provided for herein, but the increase shall not become effective until the city has officially notified the Department of the passage of the ordinance and shall not apply to those vehicles when outside of the limits of the city, nor shall the gross weight of any SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468