The city manager or his assigns shall place and maintain official traffic control devices when and as required under this traffic code to make effective the provisions of this code, and may place and maintain such additional official traffic control devices as he may deem necessary to regulate, warn or guide traffic under this code and state law.
(1995 Code of Ordinances, Title VII, Chapter 70, Section 70.20)
(a) 
All traffic control signs, signals and devices shall conform to the manual and specifications approved by the state commission on highways and public transportation. All signs and signals required hereunder for a particular purpose shall so far as practicable be uniform as to type and location throughout the city.
(b) 
All traffic control devices so erected and not inconsistent with the provisions of state law and this article shall be official traffic control devices.
(1995 Code of Ordinances, Title VII, Chapter 70, Section 70.21)
(a) 
Whenever official traffic control devices are placed in position approximately conforming to the requirements of this subchapter, such devices shall be presumed to have been so placed by the official act or direction of lawful authority, unless the contrary shall be established by competent evidence.
(b) 
Any official traffic control device placed pursuant to the provisions of this traffic code and purporting to conform to the lawful requirement pertaining to such devices shall be presumed to comply with the requirements of this traffic code, unless the contrary shall be established by competent evidence.
(1995 Code of Ordinances, Title VII, Chapter 70, Section 70.22)
The city manager or his assigns is authorized:
(1) 
To 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) 
To establish safety zones of such kind and character and at such places as he may deem necessary for the protection of pedestrians.
(3) 
To mark traffic lanes upon the roadway of any street or highway where a regular alignment of traffic is necessary.
(1995 Code of Ordinances, Title VII, Chapter 70, Section 70.23)
All traffic control signs, signals, devices and markings heretofore placed or erected by the chief of police or other officers or employees of the city and now in use for the purposes of regulating, warning or guiding traffic are hereby affirmed, ratified and confirmed to be official traffic control devices; provided, however, such traffic control devices are not inconsistent with the provisions of state law or this traffic code.
(1995 Code of Ordinances, Title VII, Chapter 70, Section 70.24)