Persons may operate bicycles upon sidewalks within residential areas; provided, however, no person shall ride a bicycle upon a sidewalk within business districts as described by this code, nor shall any person ride upon any other sidewalk within this City which has been posted by the City Engineer with signs prohibiting such riding. (Ord. 3451 § 1; Ord. 2670, 1996; Ord. 1830 § 3, 1978).