605 ILCS 10/27

It is unlawful for any person to deposit within the right-of-way limits of the toll highways trash, glass, weeds, garbage or other offensive matter; and any person so offending shall be guilty of a petty offense and shall be fined not more than $500.00. However, this section shall not apply to proper deposits of harmless materials made in good faith and in a proper manner to repair the toll highways.