Oregon Revised Statutes Oregon Vehicle Code § 814.520

(a) When overtaking and passing another motor assisted scooter or vehicle that is proceeding in the same direction.

(b) When preparing to execute a left turn.

(c) When reasonably necessary to avoid hazardous conditions including, but not limited to, fixed or moving objects, parked or moving vehicles, pedestrians, animals, surface hazards or other conditions that make continued operation along the right curb or edge unsafe or to avoid unsafe operation in a lane on the roadway that is too narrow for a motor assisted scooter and vehicle to travel safely side by side. Nothing in this paragraph excuses the operator of a motor assisted scooter from the requirements under ORS 811.425 or from the penalties for failure to comply with those requirements.

(d) When operating within a city as near as practicable to the left curb or edge of a roadway that is designated to allow traffic to move in only one direction along the roadway. A motor assisted scooter that is operated under this paragraph is subject to the same requirements and exceptions when operating along the left curb or edge as are applicable when a motor assisted scooter is operating along the right curb or edge of the roadway.

(e) When operating a motor assisted scooter alongside not more than one other motor assisted scooter as long as the motor assisted scooters are both being operated within a single lane and in a manner that does not impede the normal and reasonable movement of traffic.

(f) When operating on a bicycle lane or bicycle path.