Oregon:ORS 811.105(2)(e)
- 811.105 Speeds that are evidence of basic rule violation.
- (1) Any speed in excess of a designated speed posted by authority granted under ORS 810.180 is prima facie evidence of violation of the basic speed rule under ORS 811.100.
- (2) If no designated speed is posted by authority granted under ORS 810.180, any speed in excess of one of the following speeds is prima facie evidence of violation of the basic speed rule:
- (e) Fifty-five miles per hour in locations not otherwise described in this section.
(Source: http://www.leg.state.or.us/ors/811.html)