A. When the width of an improved roadway does not exceed 20 feet, the Pierce County Department of Planning and Public Works is authorized to erect signs indicating no parking upon both sides of such street. When the width of the improved roadway is between 20 and 28 feet, the Department of Planning and Public Works is authorized to erect a sign indicating no parking upon one side of the street.

B. When official signs prohibiting parking are erected upon narrow streets as provided in this Section, no person shall park a vehicle upon any such street in violation of any sign.