Rules of the Road for Drivers

ORS 811.500
Unlawful stop or deceleration

  • penalty


A person commits the offense of unlawful stop or deceleration if the person is operating a vehicle and the person stops or suddenly decreases the speed of the vehicle without first giving an appropriate signal to the driver immediately to the rear when there is opportunity to give the signal.


Appropriate signals for the purpose of this section are as designated under ORS 811.395 (Appropriate signals for stopping, turning, changing lanes and decelerating) and 811.400 (Failure to use appropriate signal for turn, lane change, stop or exit from roundabout).


The offense described in this section, unlawful stop or deceleration, is a Class B traffic violation. [1983 c.338 §657; 1995 c.383 §77]
Chapter 811

See also annotations under ORS chapter 483 in permanent edition.

Notes of Decisions

Under Former Similar Statute

A party in violation of a motor vehicle statute is negligent as a matter of law unless he introduces evidence from which the trier of fact could find that he was acting as a reasonably prudent person under the circumstances. Barnum v. Williams, 264 Or 71, 504 P2d 122 (1972)

Law Review Citations

Under Former Similar Statute

10 WLJ 207 (1974)


Last accessed
Jun. 26, 2021