The City Traffic Engineer shall determine and designate intersections where a particular hazard exists upon other than through streets and shall determine whether vehicles shall stop at one or more entrances to any such stop intersection and shall erect a stop sign at every such place where a stop is required. He shall determine and designate intersections where a particular hazard exists and determine whether vehicles on one of the intersecting streets shall yield the right-of-way to vehicles on the other street and shall erect a "Yield" sign at every place where such a sign is needed. The City Traffic Engineer shall maintain current records of these designations and a copy shall be kept on file with the City Clerk. (Code 1962, § 37-3.12)