625 ILCS 5/11-311

Interference with official traffic-control devices or railroad signs or signals.

No person shall without lawful authority attempt to or in fact alter, deface, injure, knock down, or remove any official traffic-control device, or any railroad sign or signal or any inscription, shield, or insignia thereon, or any other part thereof.

Every person who is convicted of a violation of this Section shall be guilty of a Class A misdemeanor, punishable by a fine of at least $250 in addition to any other penalties which may be imposed.