It shall be the duty of drive-in restaurant operators and owners of private parking areas to post on the premises in a conspicuous location one or more signs bearing the following legend:
"Cruising in or congregating and lingering outside of a motor vehicle is unlawful. No unoccupied vehicle may be left on these premises without the consent of the owner and operator."
('75 Code, § 27.09) (Ord. PO-68-3, passed 11-13-68) Penalty, see § 131.99