When signs, signals or other devices have been erected upon any roadway or in any other portion of the parking area indicating that stopping, standing or parking is prohibited during designated hours or prohibited for a longer time than is designated, no person shall park any vehicle in violation of any such signs, signals or other devices.
The provisions of this Section prohibiting the stopping, standing or parking of vehicles in the parking area shall apply at all times or at those times therein specified or as indicated on signs except when it is necessary to stop a vehicle to avoid conflict with other traffic or in compliance with the directions of a police officer.
Appropriate signs prohibiting stopping, standing or parking or prohibiting stopping, standing or parking during designated hours or prohibiting stopping, standing or parking for a longer time than is designated shall be erected in conformity with the said Plans.