(a) No person shall willfully or maliciously displace, remove, destroy or injure a mileboard, milestone, danger sign or signal, guide sign or guide post or any inscription thereon, lawfully within the right-of-way of a public highway.
(b) No person shall in any manner paint, print, place, put or affix any outdoor advertising, outdoor advertising signs, displays or devices upon or to any rock, stone, tree, fence, stump, pole, milestone, danger signal, guide sign, guide post, building or other object lawfully within the right-of-way of any public highway.