TRAFFIC-CONTROL DEVICE means a flagger, sign, signal, marking or other device used to regulate, warn or guide traffic, placed on, over or adjacent to a street, highway, private road open to public travel, pedestrian facility or shared-use path by authority of a public agency or official having jurisdiction, or, in the case of a private road open to public travel, by authority of the private owner or private official having jurisdiction.
(R.C. § 4511.01(QQ))