When any resolution of the city designates those locations to be controlled by traffic signals, the City Traffic Engineer is directed to install and maintain official traffic signals at those intersections and other places where traffic conditions are such as to require that the flow of traffic be alternately interrupted and released in order to prevent or relieve traffic congestion or to protect life or property from exceptional hazard.
('61 Code, § 13.24) (Ord. 653, passed - - )