No vehicle shall be driven to the left of the center of the roadway in overtaking and passing traffic proceeding in the same direction, unless the left side is clearly visible and is free of oncoming traffic for a sufficient distance ahead to permit the overtaking and passing to be completely made without interfering with the safe operation of any traffic approaching from the opposite direction or any traffic overtaken.  In every event, the overtaking vehicle must return to an authorized lane of travel as soon as practicable, and in the event the passing movement involves the use of a lane authorized for the traffic approaching from the opposite direction, before coming within 200 feet of any approaching vehicle.
(ORC 4511.29)
Penalty - see Sections 307.01 and 307.02