Once upon a time, the highways were thick with commercial signage. People didn't like it, so "environmentalists" solved the problem by adding this law to the books.

Now this law is used against activists just standing on an overpass holding a sign.

Let this be a lesson. Whenever you solve a problem by giving a new power to the state, it will be used to attack innocent people if at all possible. That is what the storm troopers do!