(A) No person shall stop, stand, or park a vehicle for any purpose or length of time other than the expeditious unloading and delivery or pickup and loading of materials in any place marked as a loading zone during hours when the provisions applicable to loading zones are in effect. In no case shall the stop for loading or unloading of materials exceed 15 minutes.
(B) Where stopping for the purpose of loading or unloading of merchandise or materials is permitted, vehicles used for the transportation of merchandise or materials may back into the curb to take on or discharge loads when the owner of such vehicle holds a permit issued by the Traffic Commission granting him such privilege and such permit shall be either in the possession of the driver or on the vehicle at the time such vehicle is backed against the curb to take on or discharge a load and it shall be unlawful for any owner or driver to violate any of the terms or conditions of any such special permit.
('75 Code, § 15-117) Penalty, see § 72.99(A)