331.28  ONE-WAY STREETS AND ROTARY TRAFFIC ISLANDS.
   (a)   Upon a roadway designated and posted with signs for one-way traffic, a vehicle shall be driven only in the direction designated.
   (b)   A vehicle passing around a rotary traffic island shall be driven only to the right of the rotary traffic island.
(ORC 4511.32)
Penalty - see Sections 307.01 and 307.02