625 ILCS 5/15-113.2
Whenever any vehicle is operated in violation of the provisions of a permit issued under the provisions of Sections 15-301 through 15-318 of this Chapter by operating with axle weights in excess of those authorized in such permit, the owner or driver of such vehicle shall be deemed guilty of a business offense and either the owner or the driver of such vehicle may be prosecuted for such violation. Any person, firm or corporation convicted of such violation shall be fined in an amount not less than 2 cents nor more than 5 cents per pound for each pound of excess weight on such axle or tandem axle in excess of the weight authorized in the permit when the excess is 1,000 pounds or less; not less than 5 cents nor more than 10 cents per pound for each pound of excess weight when the excess exceeds 1,000 pounds and is 2,000 pounds or less; not less than 10 cents nor more than 15 cents per pound for each pound of excess weight when the excess exceeds 2,000 pounds and is 3,000 pounds or less; and not less than 15 cents nor more than 20 cents per pound for each pound of excess weight when the excess exceeds 3,000 pounds.
Penalties for violations of this Section shall be in addition to any penalties imposed for violation of Section 15-301(j) of this Chapter.
625 ILCS 5/15-113.2