Oregon Revised Statutes Oregon Vehicle Code § 820.400

(a) Such vehicle must be driven as closely as is practicable to the right-hand edge of the roadbed, including the shoulders, if any.

(b) Such vehicle, if the movement of the vehicle occurs during the hours of darkness, must be equipped and operating two headlights, clearance lights and reflectors marking the overall width as far as practical and visible from the front, rear and sides and a taillight.

(c) An image display device may not be operated in an implement of husbandry at any time while the implement of husbandry is being operated on a highway. As used in this paragraph, “image display device” has the meaning given that term in ORS 815.240.

(d) Such vehicle must display, when driven, a slow-moving vehicle emblem described in ORS 815.060.