Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 377.720

(1) Interferes with, imitates or resembles any traffic control sign or device, or attempts or appears to attempt to direct the movement of traffic.

(2) Prevents the driver of a motor vehicle from having a clear and unobstructed view of traffic control signs or devices or approaching or merging traffic.

(3) Contains, includes or is illuminated by any flashing, intermittent, revolving, rotating or moving light or moves or has any animated or moving parts. This subsection does not apply to:

(4) Has any lighting, unless such lighting is so effectively shielded as to prevent beams or rays of light from being directed at any portion of the main traveled way of a state highway, or is of such low intensity or brilliance as not to cause glare or to impair the vision of the driver of a motor vehicle or otherwise to interfere with the operation thereof.

(5) Is located upon a tree, or painted or drawn upon a rock or other natural feature.

(6) Advertises activities that are illegal under any state or federal law applicable at the location of the sign or of the activities.

(7) Is not maintained in a neat, clean and attractive condition and in good repair.

(8) Is not able to withstand a wind pressure of 20 pounds per square foot of exposed surface.

(9) Is on a vehicle or trailer that is located on public or private property. This subsection does not apply to a vehicle or trailer used for transportation by the owner or person in control of the property.