§ 70.16  ESTABLISHMENT AND MAINTENANCE OF TRAFFIC-CONTROL DEVICES.
   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.
(`91 Code, § 70.16)