No trucks shall enter Traffic Zone I between 4:00 p.m. and 6:00 p.m. Further, no trucks shall be allowed in Zone I between the hours of 7:00 a.m. and 4:00 p.m. and the hours of 6:00 p.m. and 10:00 p.m. unless the entire shipment destined to or from Traffic Zone I is to be delivered to one location, or to be picked up at one location in Traffic Zone I, or unless the loading or unloading can be accomplished with the truck parked off the street entirely on private property. (Ord. No. G-2130, § 2)