§ 70.23 INTERFERENCE WITH OFFICIAL TRAFFIC SIGNS, 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.
(ILCS Ch. 625, Act 5 § 11-311) ('77 Code, § 70.011(B))