No person shall stop, stand, or park a vehicle for any purpose or period of time other than for the expeditious loading or unloading of passengers in any place marked as a passenger curb loading zone during hours when the regulations applicable to such curb loading zone are effective, and then only for a period not to exceed three minutes. (Ord. 2-94, amended, 1994; Ord. 8-92, amended, 1992; Ord. 108 §4, amended, 1984)