The City may, by ordinance, designate the permissible direction of traffic flow onto and from multiple driveways that serve the same premises on any occasion when the City determines that such regulation is necessary for the safety of the traveling public. In such event, the property owner shall, at the property owner's expense, erect traffic direction control devices of a sufficient size to give notice of said ordinance to the traveling public. After erection of said control device, a vehicle shall only be driven in the direction designated or permitted.