Oregon:ORS 811.111(1)(d)(D)
- 811.111 Violating a speed limit; penalty.
- (1) A person commits the offense of violating a speed limit if the person:
- (d) Drives a vehicle upon a highway in any city at a speed greater than a speed posted by authority granted under ORS 810.180 or, if no speed is posted, the following:
- (D) Twenty-five miles per hour on a highway in a residence district if the highway is not an arterial highway.
(Source: http://www.leg.state.or.us/ors/811.html)