331.03  OVERTAKING, PASSING TO LEFT; DRIVER'S DUTIES.
   The following rules govern the overtaking and passing of vehicles proceeding in the same direction:
   (a)   The operator of a vehicle overtaking another vehicle proceeding in the same direction shall, except as provided in division (c) of this section, signal to the vehicle to be overtaken, shall pass to the left thereof at a safe distance, and shall not again drive to the right side of the roadway until safely clear of the overtaken vehicle.
   (b)   Except when overtaking and passing on the right is permitted, the operator of an overtaken vehicle shall give way to the right in favor of the overtaking vehicle at the latter's audible signal, and the operator shall not increase the speed of the operator's vehicle until completely passed by the overtaking vehicle.
   (c)   The operator of a vehicle overtaking and passing another vehicle proceeding in the same direction on a divided highway as defined in Ohio R.C. 4511.35, a limited access highway as defined in Ohio R.C. 5511.02, or a highway with four or more traffic lanes is not required to signal audibly to the vehicle being overtaken and passed.
(ORC 4511.27)
Penalty - see Sections 307.01 and 307.02