Whenever authorized signs are erected indicating that no right or left or U-turn is permitted, no person operating a bicycle shall disobey the directions of any such signs, except where such person dismounts from the bicycle to make such turn, in which event such person shall then obey the regulations applicable to pedestrians. (Ord. 3451 § 1; Ord. 2670 § 1, 1996; Ord. 1641 § 1, 1975).