Whenever any ordinance of the city designates and describes a through street, it shall be the duty of the city traffic engineer to place and maintain a stop sign, or on the basis of any engineering and traffic investigation, at any intersection, a yield sign, on each and every street intersection of such through street unless traffic at any such intersection is controlled at all times by traffic control signals; provided, however, that at the intersection of two (2) such through streets or at the intersection of a through street and a heavy traffic street not so designated, stop signs shall be erected at the approaches of either or both of such streets, as may be determined by the city traffic engineer, upon the basis of an engineering and traffic study.

(Code 1964, § 12.250)

     State law reference(s)--Similar provisions, RSMo. § 300.260.