All traffic-control signs, signals and devices shall conform to the manual and specifications approved by the state transportation commission. All signs and signals required under this chapter for a particular purpose shall, so far as practicable, be uniform as to type and location throughout the city. All traffic-control devices so erected and not inconsistent with the provisions of state law or this chapter shall be official traffic-control devices.
(1987 Code, sec. 22-51)
The chief of police shall place and maintain traffic-control signs, signals and devices when and as required under this chapter to make effective the provisions of this chapter, and may place and maintain such additional traffic-control devices as he may deem necessary to regulate traffic under this chapter or under state law, or to guide or warn traffic. It shall be the duty of the chief of police to supervise the installation and proper timing and maintenance of traffic-control devices.
(1987 Code, sec. 22-52)
The chief of police is hereby authorized to:
(1) 
Designate and maintain, by appropriate devices, marks or lines upon the surface of the roadway, crosswalks at any intersection 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 ordinances of this city.
(1987 Code, sec. 22-53)
The driver of any vehicle shall obey the instructions of any official traffic-control device applicable thereto placed in accordance with this chapter and other traffic ordinances of this city, unless otherwise directed by a police officer, subject to the exceptions granted the driver of an authorized emergency vehicle.
(1987 Code, sec. 22-54)
No provision of this chapter for which signs are required shall be enforced against an alleged violator if, at the time and place of the alleged violation, an official sign is not in proper position and sufficiently legible to be seen by an ordinarily observant person. Whenever a particular section does not state that signs are required, such section shall be effective even though no signs are erected or in place.
(1987 Code, sec. 22-55)
The chief of police, as authorized by the city council from time to time, shall designate intersections at which traffic shall be controlled by electric traffic-control signals or lights and shall cause such signals or lights to be installed and maintained at such intersections.
(1987 Code, sec. 22-56)
All traffic-control signs, signals, devices and markings placed or erected prior to the adoption of this code by the police department and in use for the purpose of regulating, warning or guiding traffic are hereby affirmed, ratified and declared to be official traffic-control devices, provided such traffic-control devices are not inconsistent with the provisions of this chapter or state law.
(1987 Code, sec. 22-60)
(a) 
The chief of police may designate through streets and erect stop signs at specified entrances thereto or may designate any intersection as a stop intersection and erect stop signs at one (1) or more entrances to such intersection.
(b) 
Every stop sign shall be erected as near as practicable to the nearest line of the crosswalk on the near side of the intersection or, if there is no crosswalk, then as near as practicable to the nearest line of the intersecting street.
(1987 Code, sec. 22-64)
The chief of police, as authorized by the city council from time to time, may install and maintain yield right-of-way signs at intersections.
(1987 Code, sec. 22-65)
The chief of police is hereby authorized to mark traffic lanes upon the roadway of any street where a regular alignment of traffic is necessary.
(1987 Code, sec. 22-66)
(a) 
Whenever any resolution or ordinance of the city council designates any one-way street or alley, the chief of police shall place and maintain signs giving notice thereof, and no such regulation shall be effective unless such signs are in place. Signs indicating the direction of lawful traffic movement shall be placed at every intersection where movement of traffic in the opposite direction is prohibited.
(b) 
Upon those streets and parts of streets and in those alleys which are designated as one-way streets or alleys, vehicular traffic shall move only in the indicated direction where signs indicating the direction of traffic are erected and maintained at every intersection where movement in the opposite direction is prohibited.
(1987 Code, sec. 22-67)