A. It is determined upon the basis of an engineering and traffic investigation that the speed permitted by state law on the highways described in Section 9.50.370, all in the city of Yakima, varies from that which is deemed reasonable or safe under the conditions found to exist upon such highways and it is declared that the speed limits shall be as hereinafter set forth in Section 9.50.370 on those highways designated therein at the time specified therein when signs are erected giving notice thereof. No person shall operate a vehicle on a highway at a speed greater than is reasonable and prudent under the conditions, and having regard to the actual and potential hazards then existing, or in any event, greater than that speed limit set forth in Section 9.50.370, except as allowed for by law. (Ord. 2735 § 2 (part), 1983).