(a) The following notice must be written on each political advertising sign:
"NOTICE: IT IS A VIOLATION OF STATE LAW (CHAPTERS 392 AND 393, TRANSPORTATION CODE), TO PLACE THIS SIGN IN THE RIGHT-OF-WAY OF A HIGHWAY."
(b) A person commits an offense if the person:
(1) knowingly enters into a contract to print or make a political advertising sign that does not contain the notice required by Subsection (a); or
(2) instructs another person to place a political advertising sign that does not contain the notice required by Subsection (a).
(c) An offense under this section is a Class C misdemeanor.
(d) It is an exception to the application of Subsection (b) that the political advertising sign was printed or made before September 1, 1997, and complied with Subsection (a) as it existed immediately before that date.
(e) In this section, "political advertising sign" means a written form of political advertising designed to be seen from a road but does not include a bumper sticker.