Oregon Revised Statutes Oregon Vehicle Code § 811.450

(1) A person commits the offense of violation of posted truck routes if appropriate signs designating truck routes are posted and the person does not operate a vehicle in compliance with the posted requirements.

(2) Authority to establish and change truck routes for purposes of this section is established in ORS 810.040.

(3) It is a defense to a charge of violation of this section if the person so charged can establish that the person could not reach the person's destination without traveling upon the street, road or highway prohibited under the posted requirements.

(4) The offense described in this section, violation of posted truck routes, is a Class B traffic violation.