Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 376.355

(1) During such term as may be specified in the contract, the forest road contractor and agents and subcontractors of the forest road contractor have the right and privilege to:

(2) Whenever any forest road contractor operates any motor vehicle having a size or weight prohibited by or in excess of the limitations contained in any law pertaining to state highways, on a contract forest road which crosses a state highway, the Department of Transportation may adopt rules and regulations and issue permits for said motor vehicle to cross said state highway in the use of such contract forest road. Such rules and regulations and such permits may include, but need not be limited to, provisions for reinforcing and strengthening the highway and for the installation of signs and signals, and such other requirements as the Department of Transportation may deem necessary for the preservation of the highway and for the safety and best interest of the public. All construction and installations under such permits shall be under the supervision of the Department of Transportation and at the expense of the forest road contractor.