Oregon:ORS 811.130(1)(2)(3)

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811.130 Impeding traffic; penalty.
(1) A person commits the offense of impeding traffic if the person drives a motor vehicle or a combination of motor vehicles in a manner that impedes or blocks the normal and reasonable movement of traffic.
(2) A person is not in violation of the offense described under this section if the person is proceeding in a manner needed for safe operation.
(3) Proceeding in a manner needed for safe operation includes but is not necessarily limited to:
(a) Momentarily stopping to allow oncoming traffic to pass before making a right-hand or left-hand turn.
(b) Momentarily stopping in preparation of, or moving at an extremely slow pace while, negotiating an exit from the road.

(Source: http://www.leg.state.or.us/ors/811.html)