A person may not, without lawful authority, alter, injure, knock down, or remove or attempt to alter, injure, knock down, or remove:

1. (1) an official traffic-control device or railroad sign or signal;
2. (2) an inscription, shield, or insignia on an official traffic-control device or railroad sign or signal; or
3. (3) another part of an official traffic-control device or railroad sign or signal.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.