In Ohio, a driver can legally cross the double yellow line under some conditions:
§4511.31. Hazardous zones
(A) The department of transportation may determine those portions of any state highway where overtaking and passing other traffic or driving to the left of the center or center line of the roadway would be especially hazardous and may, by appropriate signs or markings on the highway, indicate the beginning and end of such zones. …
(B) Division (A) of this section does not apply when all of the following apply:
(1) The slower vehicle is proceeding at less than half the speed of the speed limit applicable to that location.
(2) The faster vehicle is capable of overtaking and passing the slower vehicle without exceeding the speed limit.
(3) There is sufficient clear sight distance to the left of the center or center line of the roadway to meet the overtaking and passing provisions of section 4511.29 of the Revised Code, considering the speed of the slower vehicle.