For the purpose of this part, if not inconsistent with the context:
"Department" means the department of transportation.
"Director" means the director of transportation.
"Outdoor advertising" means any device which is:
[(1)] A writing, picture, painting, light, model, display, emblem, sign, billboard, or similar device situated outdoors, which is so designed that it draws the attention of persons on any federal-aid or state highway, to any property, services, entertainment, or amusement, bought, sold, rented, hired, offered, or otherwise traded in by any person, or to the place or person where or by whom such buying, selling, renting, hiring, offering or other trading is carried on;
[(2)] A sign, billboard, poster, notice, bill, or word or words in writing situated outdoors and so designed that it draws the attention of and is read by persons on any federal-aid or state highway; or
[(3)] A sign, billboard, writing, symbol, or emblem made of lights, or a devise or design made of lights so designed that its primary function is not giving light, which is situated outdoors and draws the attention of persons on any federal-aid or state highway.