Or. Rev. Stat. § 811.390 – Unlawful use of lights to signal for passing; penalty

(1) A person commits the offense of unlawful use of lights to signal for passing if the person is operating a vehicle and the person flashes any lights as a courtesy or “do pass” signal to other drivers approaching from the rear.
(2) The offense described in this section, unlawful use of lights to signal for passing, is a Class D traffic violation.

[1983 c.338 §633; 1995 c.383 §65]