605 ILCS 5/10-502

In all cases where a bridge shall heretofore have been constructed or shall hereafter be constructed across a navigable stream by any municipality in whole or in part without the territorial limits of such city, where the population of such municipality furnishing the principal part of the expenses thereof shall not exceed 10,000 inhabitants, and where it is necessary to maintain a draw and lights, then a reasonable toll may be collected by the municipality building such bridge, to be set apart and appropriated to the expense of maintaining such bridge and keeping such bridge in repair, and of maintaining, opening and closing proper draws therefor, and lights, and to the payment of bonds or interest thereon, issued therefor, as hereinafter provided in this Division of this Article.

The General Assembly finds that electronic toll collection systems in Illinois should be standardized to promote safety, efficiency, and traveler convenience. If electronic toll collection is used on such bridge, the municipality shall configure the electronic toll collection system to be compatible with the electronic toll collection system used by the Illinois State Toll Highway Authority. The municipality may enter into an intergovernmental agreement with the Illinois State Toll Highway Authority to provide for such compatibility or to have the Authority provide electronic toll collection or toll violation enforcement services.