(a) No person shall place, maintain, or display upon or in view of any street or highway any unauthorized sign, signal, marking, or device which purports to be or is imitation of or resembles an official traffic control device, 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 traffic control device, sign or signal.
(b) No person shall place or maintain nor shall any public authority permit upon any street or highway any traffic sign or signal bearing thereon any commercial advertising.