605 ILCS 5/10-805
The municipality shall fix rates of toll to be charged for transit over and use of such a bridge. These rates shall be so fixed, charged, and adjusted as to provide revenue at all times sufficient (1) to pay the reasonable cost of maintaining (including insurance), operating and repairing the bridge; (2) to provide a sinking fund and reserves sufficient to pay the principal of and interest on the bonds out of the revenue from the bridge, as the bonds mature and fall due; (3) to pay the redemption or repurchase price of all bonds redeemed or repurchased before maturity as provided in this Division of this Article; and (4) to fulfill the terms and provisions of any agreement with holders of the bonds.
An accurate record of the cost of each bridge, the expenditures for maintaining, operating, and repairing the bridge, and of the daily tolls collected, shall be kept and shall be available for the information of all persons interested. The municipality shall classify in a reasonable way all traffic over the bridge, and the tolls shall be fixed and adjusted by it as to be uniform in their application to all traffic falling within any such reasonable class.
The municipality shall operate the bridge as a toll bridge and after all the covenants contained in the ordinance authorizing the issuance of any revenue bonds have been complied with annually and there be any surplus revenues remaining such surplus may be appropriated by such municipality for any proper corporate purpose, or pledged for the payment of any revenue bonds issued under this Division of this Article by the municipality for the construction or acquisition of any other bridge or bridges. After all bonds payable out of the revenues thereof have been paid in full, the municipality may continue to operate such bridge as a toll bridge and rates shall be fixed, charged and adjusted so as to produce revenue annually in an amount not to exceed 5% of the cost of the bridge as shown by the records of the municipality required to be kept as in this Division of this Article provided. The revenues thus produced shall be used to maintain, operate and repair such bridge, provided any surplus remaining after properly setting aside sums for maintenance, operation and repair of the bridge may be appropriated for any corporate purpose or pledged for the payment of any revenue bonds issued under this Division of this Article by the municipality for the construction or acquisition of any other bridge or bridges.
605 ILCS 5/10-805