Or. Rev. Stat. § 803.650 – Placement of permits in vehicles; rules

(1) A permit issued under ORS 803.600, 803.615 or 803.625 shall be placed on the left side of the rear window of the vehicle unless:
1. (a) The vehicle has no rear window; or
2. (b) The design of the vehicle or of any equipment lawfully added to the vehicle is such that a permit placed as required by this section could not easily be seen from outside the vehicle.
(2) The Department of Transportation shall adopt rules for the placement of permits that cannot be placed on the left side of the rear window of a vehicle.

[1987 c.166 §2]