It shall be unlawful for any person to place, maintain or display upon or in view of any street an unofficial sign, signal or device which purports to be or is an imitation of or resembles an official traffic sign or signal, or which attempts to direct the movement of traffic or which hides from view or interferes with the effectiveness of any official sign or signal. Every prohibited sign, signal or device is hereby declared to be a public nuisance, and the Police Chief may remove the same or cause it to be removed without notice.
('88 Code, § 18.234.8) Penalty, see § 70.99