My state bans all billboards. They're thought pollution.
https://movia.media/moving-billboard-blog/why-is-billboard-a...
A ban in California would seem illegal as well, due to the affirmative right to free speech contained in the California Constitution (see Pruneyard Shopping Center v. Robins).
Here in Maine, on-premises signs are allowed but have strict limitations:
https://legislature.maine.gov/statutes/23/title23sec1914.htm...
It looks like sign bans are usually unconstitutional when content-based, where the substance of what is being communicated is taken into account (e.g. bans on only commercial signs), but generally hold up if content-neutral and based on reasonable factors, such as safety or aesthetics.
See Reed v. Town of Gilbert (content-based ban struck down) versus Scenic Arizona v. City of Phoenix (content-neutral and safety-based ban on electronic signs upheld).
https://www.scenic.org/sign-control/billboard-laws/important...