The center lane of five lanes for vehicular traffic in both directions on Mayfield Road and S.O.M. Center Road is hereby reserved as a left turning lane only. Such lane shall not be entered except for making left turns as hereinafter provided, except to pass other vehicular traffic in the event of an emergency or when directed by a police officer. Entry into such lane for left turns shall not be made more than 200 feet from the point of turning, unless such 200 foot entryway is intersected by a street intersecting from the left side.