(1) A person commits the offense of failure to keep a camper, trailer or truck in the right lane if the person is operating any of the vehicles described in this subsection and the person does not drive in the right lane of all roadways having two or more lanes for traffic proceeding in a single direction. This subsection applies to all of the following vehicles:
(a) Any camper.
(b) Any vehicle with a trailer.
(c) Any vehicle with a registration weight of 10,000 pounds or more.
(2) This section does not require the described vehicles to be driven in the right lane under any of the following circumstances:
(a) When overtaking and passing another vehicle proceeding in the same direction under the rules governing this movement in ORS 811.410 to 811.425 when such movement can be made without interfering with the passage of other vehicles.
(b) When preparing to turn left.
(c) When reasonably necessary in response to emergency conditions.
(d) To avoid actual or potential traffic moving onto the right lane from an acceleration or merging lane.
(e) When necessary to follow traffic control devices that direct use of a lane other than the right lane.
(3) The offense described in this section, failure to keep camper, trailer or truck in the right lane, is a Class B traffic violation.