§ 17-7.  Prohibited signs.
   It shall be unlawful for any person to place, maintain or to display upon or in view of any street any unofficial sign, signal or device which purports to be or is an invitation of or resembles any official traffic sign, signal, token or device, or which may hide same from view, or which attempts to direct or control or regulate the traffic on the streets of the city; and any such prohibited sign, signal or device is declared to be a nuisance, and the chief of police is empowered to remove the same or cause same to be removed without notice.
(Code 1977, § 50.060(1)(b))