(a) The driver or person in charge of a vehicle shall not back such vehicle to the curb of a street for the purpose of loading or unloading such vehicle except upon special permit from the Chief of Police, and if such vehicle is horse-drawn, then the horse or horses shall be parallel with the curb and facing in the direction the traffic is moving at that curb.
(b) The Chief of Police is 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. Such 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 person the privilege as stated and authorized herein, and no permittee or other person shall violate any of the special terms or conditions of any such permit.