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conclusive evidence of the maximum weight that can be maintained with safety to the bridge or structure. (Source: P.A. 102-124, eff. 7-23-21.) (Text of Section after amendment by P.A. 104-436) Sec. 15-111. Wheel and axle loads and gross weights. (a) No vehicle or combination of vehicles with pneumatic tires may be operated, unladen or with load, when the total weight on the road surface exceeds the following: 20,000 pounds on a single axle; 34,000 pounds on a tandem axle with no axle within the tandem exceeding 20,000 pounds; 80,000 pounds gross weight for vehicle combinations of 5 or more axles; or a total weight on a group of 2 or more consecutive axles in excess of that weight produced by the application of the following formula: W = 500 times the sum of (LN divided by N-1) + 12N + 36, where "W" equals overall total weight on any group of 2 or more consecutive axles to the nearest 500 pounds, "L" equals the distance measured to the nearest foot between extremes of any group of 2 or more consecutive axles, and "N" equals the number of axles in the group under consideration. The above formula when expressed in tabular form results in allowable loads as follows: Distance measured to the nearest foot between the SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468