Highway Beautification Act (1965)
Lady Bird Johnson's campaign led to the Highway Beautification Act, which restricted billboards along interstate highways and required states to control outdoor advertising or lose federal highway funds.
The act created the framework for billboard regulation, including the concept of nonconforming signs that predate the law and are grandfathered in.
The act established the legal foundation for local billboard regulation, including the nonconforming use rules that apply to the Charleston Boulevard sign.
The Charleston Boulevard sign is nonconforming under current Las Vegas zoning, and the digital conversion request tests how far the city will allow modification of grandfathered signs.
