337.13  TWO LIGHTS DISPLAYED.
   At all times mentioned in Ohio R.C. 4513.03 or a substantially equivalent municipal ordinance, at least two lighted lights shall be displayed, one near each side of the front of every motor vehicle, except when such vehicle is parked subject to the regulations governing lights on parked vehicles.
(ORC 4513.14)
Penalty - see Sections 307.01 and 307.02