Best I could find was the following from Oregon Revised Statues
http://www.leg.state.or.us/ors/811.html
*811.065 Unsafe passing of person operating bicycle; penalty.* (1) A driver
of a motor vehicle commits the offense of unsafe passing of a person
operating a bicycle if the driver violates any of the following
requirements:**
(a) The driver of a motor vehicle may only pass a person operating a
bicycle by driving to the left of the bicycle at a safe distance and
returning to the lane of travel once the motor vehicle is safely clear of
the overtaken bicycle. For the purposes of this paragraph, a “safe distance”
means a distance that is sufficient to prevent contact with the person
operating the bicycle if the person were to fall into the driver’s lane of
traffic. This paragraph does not apply to a driver operating a motor
vehicle:
(A) In a lane that is separate from and adjacent to a designated
bicycle lane;
(B) At a speed not greater than 35 miles per hour; or
(C) When the driver is passing a person operating a bicycle on the
person’s right side and the person operating the bicycle is turning left.
(b) The driver of a motor vehicle may drive to the left of the center
of a roadway to pass a person operating a bicycle proceeding in the same
direction only if the roadway to the left of the center is unobstructed for
a sufficient distance to permit the driver to pass the person operating the
bicycle safely and avoid interference with oncoming traffic. This paragraph
does not authorize driving on the left side of the center of a roadway when
prohibited under ORS 811.295, 811.300 or 811.310 to 811.325.
(c) The driver of a motor vehicle that passes a person operating a
bicycle shall return to an authorized lane of traffic as soon as
practicable.
(2) Passing a person operating a bicycle in a no passing zone in
violation of ORS 811.420 constitutes prima facie evidence of commission of
the offense described in this section, unsafe passing of a person operating
a bicycle, if the passing results in injury to or the death of the person
operating the bicycle.
(3) The offense described in this section, unsafe passing of a person
operating a bicycle, is a Class B traffic violation. [2007 c.794 §2]