(a) No vehicle shall be turned so as to proceed in the opposite direction upon any curve, or upon the approach to or near the crest of a grade, if such vehicle cannot be seen within 500 feet by the driver of any other vehicle approaching from either direction.
(ORC 4511.37)
(b) No vehicle shall be turned so as to proceed in the opposite direction within an intersection, or upon any street in a business district, or upon a freeway, expressway or controlled-access highway, or where authorized signs are erected to prohibit such movement, or at any other location unless such movement can be made with reasonable safety to other users of the street and without interfering with the safe operation of any traffic that may be affected by such movement.