Oregon:ORS 811.340(1)(a)
- 811.340 Improperly executed left turn; penalty.
- (1) A person commits the offense of making an improperly executed left turn if the person operates a vehicle and is intending to turn the vehicle to the left and the person does not:
- (a) Approach the turn in the extreme left-hand lane lawfully available to traffic moving in the direction of travel of the turning vehicle;
(Source: http://www.leg.state.or.us/ors/811.html)