Whenever any ordinance or resolution of this City 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 grade crossing at which vehicles are required to stop, the City Traffic Engineer shall erect and maintain stop signs as follows:

A stop sign shall be erected on every street intersection 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 State Vehicle Code.