(a) After June 8, 1971, no advertising device shall be erected or maintained:

1. (1) which purports to be or resembles an official traffic-control device, sign, or signal, or railroad sign or signal; or which hides from view or interferes in any material degree with the effectiveness of any traffic-control device, sign, or signal, or railroad sign or signal, or which obstructs or interferes with the driver's view of approaching, merging, or intersecting traffic for a distance not to exceed 500 feet;
2. (2) which prominently displays the word "stop" or "danger";
3. (3) which contains statements, words, or pictures of an obscene, indecent, or immoral character, or such as would offend public morals or decency;
4. (4) on any right-of-way of the interstate system of highways, except as otherwise provided by law or allowed by the commissioner;
5. (5) on private land without the consent of the owner or occupant thereof;
6. (6) on trees, shrubs, or which are painted or drawn upon rocks or natural features, or on public utility poles;
7. (7) which has distracting flashing or moving lights so designed or lighted as to be a traffic hazard;
8. (8) to which access can be obtained only from an interstate main-traveled way but excluding frontage roads adjacent thereto;
9. (9) which are structurally unsafe, are in disrepair, or are abandoned.