No person shall stop, stand or park a vehicle for any purpose other than to load or unload physically disabled persons or for the expeditious loading or unloading of goods, materials or merchandise in any place marked by sign(s) or yellow curb as a freight loading zone during the hours indicated by such sign(s). Vehicles displaying State "Disabled Parking" identifying insignia may stop, stand or park in a freight loading zone while loading or unloading physically disabled persons for a period not to exceed five minutes. A stop for loading or unloading goods, materials or merchandise in a freight loading zone shall not exceed thirty minutes unless an approved extended loading permit issued by the Police Department is prominently displayed in the windshield of the vehicle. All vehicles loading or unloading goods, materials or merchandise in a freight loading zone shall have commercial license plates. (Code 1962, § 37-50.22; Ord. No. G-943, § 2; Ord. No. G-2479, § 1; Ord. No. G-2835, § 2)