Whenever any regulation designates and describes any street or portion thereof as a through street, or any intersection at which vehicles are required to stop at one or more entrances thereto, or any railroad crossing at which vehicles are required to stop, the City Engineer shall erect and maintain stop signs as follows: A stop sign shall be erected on each and every street intersecting such through street or portion thereof so designated, and at those entrances of other intersections where a stop is required and at any railroad grade crossing so designated. Every such sign shall conform with, and shall be placed as provided in, the Vehicle Code. (Ord. 2670, 1996; Ord. 973 § 1, 1966; prior code § 19.7.1).