Section 811.405 - Failure to signal with lights; exceptions; penalty(1) A person commits the offense of failure to signal with lights when required if a person is operating a vehicle and does not use the vehicle lighting equipment described under ORS 811.395 to signal when turning, changing lanes, stopping or suddenly decelerating under any of the following circumstances:(a) During limited visibility conditions.(b) At any time the person is operating a vehicle or combination of vehicles in which the distance from the center of the top of the steering post to the left outside limit of the body, cab or load of the vehicle is greater than 24 inches.(c) At any time the person is operating a vehicle or combination of vehicles in which the distance from the center of the top of the steering post to the rear limit of the body or load is greater than 14 feet.(2) This section does not require the driver of a moped or bicycle that is not equipped with lighting equipment to use lighting equipment when required by this section. A driver of such moped or bicycle shall signal by means of appropriate hand and arm signals described under ORS 811.395 without violation of this section.(3) The offense described in this section, failure to signal with lights when required, is a Class D traffic violation. 1983 c.338 §636; 1985 c.16 §315; 1995 c.383 §67