The City Council by resolution may establish commercial loading zones and passenger loading zones in any business district and elsewhere in front of the entrance to any place of business or in front of any hall or place used for the purpose of public assembly. In no event shall more than one-half of the total curb length in any block be reserved for such zones. The Director of Public Works shall indicate such zones as follows:
(a)
Commercial loading zones by yellow paint upon the top and face of all curbs within such zones.
(b)
Passenger loading zones by white paint upon the top and face of all curbs within such zones.
Commercial loading zones and passenger loading zones may be established in limited parking spaces during specified hours of the day. When so established, the Director of Public Works shall place and maintain appropriate signs which shall clearly state the restriction to commercial loading zones or passenger loading zones and the hours of restriction. When such signs are in place no curb painting shall be required.