625 ILCS 5/12-711

Commencing January 1, 1987, all trucks equipped with self-compactors or roll-off hoists and roll-on containers for garbage or refuse hauls shall, before operating on any public or private highway, alley or parking area of this State, be equipped with an operably working external audible warning signal device that meets the standard of American National Standards Institute, SAE J994b, Type A, B or C, which is activated when the vehicle is operated in reverse or when top-hinged tailgates are open.