(a) No person shall stop, stand or park a vehicle for any purpose or length of time other than for the expeditious unloading and delivery or pickup and loading of materials in any place marked as a truck loading zone during hours when the provisions applicable to such zones are in effect. In no case shall the stop for loading and unloading of materials exceed thirty minutes.
(b) In places where and at hours when stopping for the loading or unloading or 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.
(1949 Code Sec. 62.40)