Oregon:ORS 814.410(1)(d)
- 814.410 Unsafe passing on left; penalty.
- (1) A person commits the offense of unsafe passing on the left if the person violates any of the following requirements concerning the overtaking and passing of vehicles:
- (d) An overtaking vehicle shall return to an authorized lane of traffic as soon as practicable.
(Source: http://www.leg.state.or.us/ors/814.html)