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A. Installation, Maintenance Generally: The city traffic engineer shall place and maintain traffic control signs, signals, and devices when and as required under the provisions of this title and traffic ordinances of the city to make effective the provisions of said ordinances, and may place and maintain such additional traffic control devices as he may deem necessary to regulate traffic under the traffic ordinances of the city or under state law or to guide or warn traffic. (1980 Code § 34-222)
B. Presumption Of Legality:
1. Whenever official traffic control devices are placed in position approximately conforming to the requirements of this title, 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.
2. Any official traffic control device placed pursuant to the provisions of this title and purporting to conform to the lawful requirements pertaining to such devices shall be presumed to comply with the requirements of this title, unless the contrary shall be established by competent evidence. (1980 Code § 34-228)
C. Ratification Of Existing Devices: All traffic control signs, signals, devices and markings placed or erected prior to the adoption of this code 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 title or state law. (1980 Code § 34-229)
D. Designation Of Crosswalks, Safety Zones: The city traffic engineer is hereby 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. (1980 Code § 34-236)
E. Traffic Lanes; Designation: The city traffic engineer is hereby authorized to mark traffic lanes upon the roadway of any street or highway where a regular alignment of traffic is necessary. (1980 Code § 34-237)
F. One-Way Streets, Alleys:
1. Designation: Whenever any ordinance of the city designates any one-way street or alley, the city traffic engineer 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. (1980 Code § 34-239)
2. Direction Of Traffic: Upon those streets and parts of streets and in those alleys designated as one-way streets or alleys, vehicular traffic shall move only in the indicated direction when signs indicating the direction of traffic are erected and maintained at every intersection where movement in the opposite direction is prohibited. (1980 Code § 34-240)
3. Certain Lanes For Opposite Direction Use:
a. The city traffic engineer is, with the recommendation of the planning commission, hereby authorized to determine and designate streets, parts of streets or specific lanes thereon upon which vehicular traffic shall proceed in one direction during one period and the opposite direction during another period of the day and shall place and maintain appropriate markings, signs, barriers or other devices to give notice thereof. The city traffic engineer may erect signs temporarily designating lanes to be used by traffic moving in a particular direction, regardless of the centerline of the roadway. (1980 Code § 34-241; amd. Ord. 6158, 6-11-2012)
b. It shall be unlawful for any person to operate any vehicle in violation of such markings, signs, barriers or other devices so placed in accordance with this subsection. (1980 Code § 34-241)
G. Restrictions Upon Use Of Streets By Certain Vehicles:
1. The city traffic engineer is hereby authorized to determine and designate those heavily traveled streets upon which shall be prohibited the use of the roadway by motor driven cycles, bicycles, horse drawn vehicles or other nonmotorized traffic and shall erect appropriate signs giving notice thereof.
2. When signs are so erected giving notice thereof, no person shall disobey the restrictions stated on such signs. (1980 Code § 34-245)