The city traffic engineer shall erect and maintain stop signs as follows:

A stop sign shall be erected on each and every street intersecting through streets or portions thereof, and at those entrances to other intersections where a stop is required, and at railroad grade crossings so designated; provided, however, stop signs shall not be erected or maintained at any entrance to an intersection when such entrance is controlled by an official traffic control signal. Every such sign shall conform with, and shall be placed as provided in, the Vehicle Code. (Ord. No. 1044.)