Preferential parking referenced in this chapter shall be in effect and enforced on such days of the week and during such time periods as shall be determined by the director, based upon sound traffic engineering principles, traffic investigation and surveys made from time to time, and shall be posted upon such streets. Nothing in this chapter shall be construed as permitting overnight parking or to permit parking during times or hours, or by type of vehicle otherwise prohibited in this title or by any provision of the California Vehicle Code. (Ord. 6665 § 2 (part), 1996)