When by this chapter or any other ordinance of the city, and except for parking meter zones, any parking time limit is imposed or parking is prohibited on designated streets or parts of streets, the city shall erect or place and maintain appropriate signs or traffic markings giving notice thereof and no such regulations shall be effective unless said signs or traffic marking are erected and in place at the time of any alleged violation. (Ord. 2018-03, 7-10-2018)