The answer can be found in the Oregon Revised Statutes...
811.100 Violation of basic speed rule; penalty. (1) A person commits the offense of violating the basic speed rule if the person drives a vehicle upon a highway at a speed greater than is reasonable and prudent, having due regard to all of the following:
(a) The traffic.
(b) The surface and width of the highway.
(c) The hazard at intersections.
(f) Any other conditions then existing.
(2) The following apply to the offense described in this section:
(a) The offense is as applicable on an alley as on any other highway.
(b) Speeds that are prima facie evidence of violation of this section are established by ORS 811.105.
(c) This section and ORS 811.105 establish limitation on speeds that are in addition to speed limits established in ORS 811.111.
(3) Except as provided in subsection (4) of this section, violation of the basic speed rule by exceeding a designated speed posted under ORS 810.180 is punishable as provided in ORS 811.109.
(4) The offense described in this section, violating the basic speed rule, is a Class B traffic violation if the person drives a vehicle upon a highway at a speed that is not reasonable and prudent under the circumstances described in subsection (1) of this section even though the speed is lower than the appropriate speed specified in ORS 811.105 as prima facie evidence of violation of the basic speed rule. [1983 c.338 §563; 1987 c.887 §9; 1989 c.592 §4; 1991 c.728 §5; 1999 c.1051 §229; 2003 c.819 §5]
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