All official traffic signs and signals existing at the time of the adoption of the ordinance codified in this chapter, such as stop signs, caution signs, slow signs, no-reverse-turn signs, signs designating time limits for parking, lines painted or marked on street curb designating parking areas, markers designating loading zones, no-parking areas, and all other official traffic signs or signals erected, installed, or painted for the purpose of directing, controlling and regulating traffic, shall be considered official under the provisions of this chapter; provided, however, that the council may, by motion, at any time have any such official traffic signs or signals removed or changed; and provided further, that any additional traffic signs or signals erected, installed, painted or marked shall first be authorized by motion of the council. (Ord. 1986 § 3 (Exh. A), 2014)