It is unlawful to stand, park or angle park any vehicle in any place established as a loading zone as designated in ACC 10.36.480 through 10.36.510 except for the purpose of, and only for such period of time as necessary for, expeditious loading or unloading of such commercial or passenger vehicle. In no case shall the stop for loading or unloading of articles or materials or passengers exceed 15 minutes in time. The provisions of this article shall not be applicable between the hours of 6:00 p.m. and 6:00 a.m. or on Sundays and holidays. (Ord. 5212 § 1 (Exh. F), 1999; 1957 code § 9.22.260.)