No person shall stop, stand or park a vehicle on a crosswalk, within twenty feet of a stop sign or other traffic control device located at the side of the portion of a shopping center or public grounds traversed by vehicles, or within ten feet of a doorway or other access or entrance to the rear of a building except for loading or unloading.  The Police Chief is authorized to designate or approve the marking of no parking areas prescribed by this chapter by signs or painted lines on curbs subject to Council approval.