Oregon:ORS 811.375(1)(b)
- 811.375 Unlawful or unsignaled change of lane; penalty.
- (1) A person commits the offense of unlawful or unsignaled change of lanes if the person is operating a vehicle upon a highway and the person changes lanes by moving to the right or left upon the highway when:
- (b) The driver fails to give an appropriate signal continuously during not less than the last 100 feet traveled by the vehicle before changing lanes.
(Source: http://www.leg.state.or.us/ors/811.html)