337.09  LIGHTS ON PARKED OR STOPPED VEHICLES.
   Except in case of an emergency, whenever a vehicle is parked or stopped upon a roadway open to traffic or a shoulder adjacent thereto, whether attended or unattended, during the times mentioned in Ohio R.C. 4513.03 or a substantially equivalent municipal ordinance, such vehicle shall be equipped with one or more lights which shall exhibit a white or amber light on the roadway side visible from a distance of 500 feet to the front of such vehicle, and a red light visible from a distance of 500 feet to the rear.  No lights need be displayed upon any such vehicle when it is stopped or parked within the Municipality where there is sufficient light to reveal any person or substantial object within a distance of 500 feet upon such highway.  Any lighted headlights upon a parked vehicle shall be depressed or dimmed.
(ORC 4513.10)
Penalty - see Sections 307.01 and 307.02