The Traffic Engineer is hereby authorized to issue special permits to permit the backing of a vehicle to the curb for the purpose of loading or unloading merchandise or materials subject to the terms and conditions of such permit. Permits may be issued either to the owner or lessee of real property or to the owner of the vehicle and shall grant to such a person the privilege as therein stated and authorized herein. It is unlawful for any permittee or other person to violate any of the special terms or conditions of any such permit; provided, however, that no permit issued hereunder shall be exclusive. (Ord. 304 § 84, 1963).