(A) The city shall establish and maintain all official traffic-control devices necessary within the city. All traffic-control devices, including signs, shall be employed to indicate one particular warning or regulation, shall be uniform, and as far as possible shall be placed uniformly. All traffic-control devices and signs shall conform to required state specifications.
(B) All signs, signals, markings and other devices placed or erected at the time of 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 chapter or state law.
(1997 Code, § 70.16)