In my area, Southern California, the signs to be taken seriously are of two parts: The restriction, prohibition, or what ever it's called is in large print. Then in small print, typically at the bottom of the sign the there's a reference to the law, code or regulation that provides the authority for the restriction/prohibition and, sometimes, the maximum penalty for violation. Often a contact number for local LE is included.
How does this compare with the signs in your area?
How does this compare with the signs in your area?