(A) The Traffic Division may designate the place or places within the 2-hour parking area of the city where motor trucks and vehicles may stop and unload merchandise, and the Traffic Division shall appropriately designate and mark off the space or spaces so designated by the Traffic Division for loading and unloading. In using the space or spaces for loading and unloading all vehicles must be in the process of loading or unloading, and no vehicle shall remain parked in the space or spaces longer than is necessary to load, unload, deliver, receive, collect or give receipts for merchandise so delivered or received.
(B) The space or spaces are for public convenience and are not designated for the specific use of any person, firm or corporation, but they shall be used exclusively for loading and unloading purposes and no vehicles shall remain parked therein longer than necessary to accomplish those purposes.