Content bans are unconstitutional, blanket bans on visual pollution are not, as in Vermont, Alaska, Hawaii, Maine, and Austin.
https://en.wikipedia.org/wiki/Reed_v._Town_of_Gilbert
https://en.wikipedia.org/wiki/City_of_Austin_v._Reagan_Natio...
https://en.wikipedia.org/wiki/Reed_v._Town_of_Gilbert
https://en.wikipedia.org/wiki/City_of_Austin_v._Reagan_Natio...
I grew up there, and seeing billboards other places was jarring.