Ohio Revised Code Title XLV. Motor Vehicles Aeronautics Watercraft § 4513.05

(A) Every motor vehicle, trackless trolley, trailer, semitrailer, pole trailer, or vehicle which is being drawn at the end of a train of vehicles shall be equipped with at least one tail light mounted on the rear which, when lighted, shall emit a red light visible from a distance of five hundred feet to the rear, provided that in the case of a train of vehicles only the tail light on the rearmost vehicle need be visible from the distance specified.

Either a tail light or a separate light shall be so constructed and placed as to illuminate with a white light the rear registration plate, when such registration plate is required, and render it legible from a distance of fifty feet to the rear. Any tail light, together with any separate light for illuminating the rear registration plate, shall be so wired as to be lighted whenever the headlights or auxiliary driving lights are lighted, except where separate lighting systems are provided for trailers for the purpose of illuminating such registration plate.

(B) Whoever violates this section is guilty of a minor misdemeanor.