Ohio Revised Code Title XLIX. Public Utilities § 4955.33

At all points where its railroad crosses a public road at a common grade, each company shall erect crossbuck signing at positions at each such crossing that are in accordance with the department of transportation manual for uniform traffic control devices, adopted under section 4511.09 of the Revised Code, to give notice of the proximity of the railroad and warn persons to be on the lookout for the locomotive. Any such signing that has been or is erected in accordance with this section may lawfully be continued in use until it is replaced. A company that neglects or refuses to comply with this section is liable in damages for all injuries that occur to persons or property from such neglect or refusal.