Whenever the board of public works and safety, after receiving the recommendation of the city engineer based upon engineering and traffic investigation, designates and describes a through street or an intersection where particular hazards exist, it shall be the duty of the city traffic

engineer to place and maintain a stop sign on each and every street intersecting such through street or intersecting that portion thereof or other intersection and designated as such by the board of public works and safety. (Prior code § 15-43)