The owner, lessee or operator of any drive-in restaurant shall furnish and post on the premises, in a conspicuous location, one or more signs bearing the following legend:
"Cruising in or congregating and loitering outside of a motor vehicle is unlawful. No unoccupied vehicles may be left on these premises without the consent of the proprietor. Any vehicle left on the premises unoccupied for over one hour will be impounded pursuant to Section 303.08 et seq. of the Code of Ordinances of the
City of Mentor, Ohio."
(1969 Code 115.06)