Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 377.715

ORS 377.700 to 377.844, and the rules adopted pursuant thereto, apply to signs erected or maintained outside the right of way along state highways and visible to the traveling public from a state highway. A person may not erect or maintain a sign visible to the traveling public from a state highway, except where permitted outside the right of way of a state highway, unless the sign complies with the provisions of ORS 377.505 to 377.540 and 377.700 to 377.844, and the rules adopted pursuant thereto. A person may not erect or maintain a sign on the right of way of a state highway, other than a traffic control sign or device.