The City Engineer is authorized to erect signs indicating no parking upon either or both sides of any street adjacent to any school property when such parking would, in his opinion, interfere with traffic or create a hazardous situation. When official signs are erected indicating no parking upon that side of a street adjacent to any school property, no person shall park a vehicle in any such designated place. [Code 1970 § 10.52.040; Code 1954 § 8-32.16.]