The Supreme Court ruled in 2022 that the city of Austin’s regulations that
prohibited new digital billboards or conversion of existing billboards to
digital are not a violation of the free speech clause of the First
Amendment just because the regulations allow digitization of signs that are
the premise of a business.

City of Ladue v. Gilleo (1994) said a city could not stop homeowners from
posting political signs. Banning these signs stopped First Amendment
protected expression.

Metromedia, Inc. v. City of San Diego (1981) invalidated a city ordinance
prohibiting outdoor advertising display signs because it reached “too far”
into protected speech.

Reed v. Town of Gilbert (2015) invalidated a city ordinance that restricted
the size of directional signs after a pastor challenged the law as
violating the First Amendment.