The City Manager, subject to any directions which the Council may give by motion or resolution, is authorizes to have placed markers, buttons or signs within or adjacent to intersection’s indicating the course to be traveled by vehicles turning at the intersections. The course to be traveled, as so indicated, and may conform to or be other than as prescribed by law or ordinance.
(47 O.S. § 11-601) (`90 Code, § 20-51)