811.415 Unsafe passing on right; penalty.
...
(2) For purposes of this section, a person may drive a vehicle to overtake and pass upon the right of another vehicle under any of the following circumstances:
(a) Overtaking and passing upon the right is permitted if:
...
(B) The paved portion of the highway is of sufficient width to allow two or more lanes of vehicles to proceed lawfully in the same direction as the overtaking vehicle; and
...
(b) Overtaking and passing upon the right is permitted if the overtaken vehicle is proceeding along a roadway in the left lane of two or more clearly marked lanes allocated exclusively to vehicular traffic moving in the same direction as the overtaking driver.
Source:
ORS 811.