San Diego County Municipal Code Art. 4 Turning Movements

The Road Commissioner is authorized to place pavement markings, markers, buttons, or signs within or adjacent to intersections indicating the course to be traveled by vehicles turning at such intersections, and the Road Commissioner is authorized to allocate and indicate more than one lane of traffic from which drivers of vehicles may make right or left hand turns, and the course to be traveled as so indicated may conform to or be other than as prescribed by law or ordinance.

The Road Commissioner is hereby authorized to determine those intersections at which drivers of vehicles shall not make a right, left, or U turn, and shall place proper signs at such intersections. The making of such turns may be prohibited between certain hours of any day and permitted at other hours, in which event the same shall be plainly indicated on the signs or they may be removed when such turns are permitted.

Whenever authorized signs are erected indicating that no right or left or U turn is permitted, no driver of a vehicle shall disobey the directions of any such sign.

The Road Commissioner is hereby authorized to determine those intersections at which drivers of vehicles shall not make a right turn against a red or stop signal and shall erect proper signs giving notice of such prohibition. No driver of a vehicle shall disobey the directions of any such sign.