(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 may conform to or be other than as prescribed by law or ordinance.
(b) 
When authorized markers, buttons, or other indications are placed within an intersection indicating the course to be traveled by vehicles turning thereat, no driver of a vehicle shall disobey the directions of such indications.
(Ordinance 1006, sec. 58, adopted 11/6/67; 1996 Code, sec. 10.602)
The city traffic engineer 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.
(Ordinance 1006, sec. 59, adopted 11/6/67; 1996 Code, sec. 10.603)
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.
(Ordinance 1006, sec. 60, adopted 11/6/67; 1996 Code, sec. 10.604)
The driver of any vehicle shall not turn such vehicle so as to proceed in the opposite direction upon any street in a business district, in the middle of any block, or at a signalized or controlled intersection.
(Ordinance 1006, sec. 61, adopted 11/6/67; 1996 Code, sec. 10.605)