It is unlawful for any person, firm or corporation to supply or sell any gasoline, oil or other service station products, or any service incident thereto, to any motor driven vehicle, or to the owner or operator thereof, when or while the motor vehicle is parked upon or occupying any portion of any public sidewalk adjacent to the service station, nor stretch any gasoline or air hose across the public sidewalk, nor to use the public sidewalk for any purpose interfering with the intended use of the sidewalk as such by pedestrians. (Prior Code § 9-209.)