(a) The city traffic engineer is authorized to place markers, buttons or signs within or adjacent to intersections indicating the course to be traveled by vehicles turning at such intersections, and such course to be traveled as so indicated shall conform to that prescribed by law or ordinance except as provided in paragraph (b).

    (b) The city traffic engineer, with the approval of the director of public works, is authorized to place temporary markers, signs or barricades within, before or adjacent to any construction site, demolition site or emergency scene, directing traffic around or on a specific course through such scene or site which is other than that prescribed by law or ordinance, when deemed necessary to further public safety, convenience and expedition of traffic, for the duration of such emergency or condition and no longer.

    (c) When authorized markers, buttons or other indications are placed within or adjacent to intersections indicating the course to be traveled by vehicles turning thereat, no driver of a vehicle shall disobey the directions of such indications.

(Code 1964, § 12.300)

     State law reference(s)--Similar provisions, RSMo. § 300.220.