The director of public works shall have the authority to install and maintain traffic-control signs, signals and devices when required under this chapter and other traffic regulations of the city. He may install and maintain such additional traffic-control devices as he may deem necessary to regulate traffic under this chapter and other traffic regulations of the city or under state law or to guide or warn traffic.
(1989 Code, sec. 16-61; 2009 Code, sec. 12.03.001)
The director of public works is hereby authorized to:
(1) 
Designate and maintain, by appropriate devices, marks or lines upon the surface of the roadway, crosswalks at intersections where in his opinion there is particular danger to pedestrians crossing the roadway, and at such other places as he may deem necessary;
(2) 
Establish safety zones of such kind and character and at such places as he may deem necessary for the protection of pedestrians;
(3) 
Mark lanes for traffic on street pavements at such places as he may deem advisable, consistent with this chapter and other traffic regulations of the city.
(1989 Code, sec. 16-62; 2009 Code, sec. 12.03.002)
The director of public works shall determine areas to be designated as school zones and shall erect signs designating such zones and school crossings and stating the maximum permissible speed through zones and crossings.
(1989 Code, sec. 16-63; 2009 Code, sec. 12.03.003)
(a) 
The director of public works 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.
(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.
(1989 Code, sec. 16-64; 2009 Code, sec. 12.03.004)
(a) 
The director of public works 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.
(b) 
Whenever authorized signs are erected indicating that no right, left or U-turn is permitted, no driver of a vehicle shall disobey the directions of any such sign.
(1989 Code, sec. 16-65; 2009 Code, sec. 12.03.005)