OAR 734-074-0035: Speeds

Vehicles operating under permits authorized through OAR 734, Division 74, shall maintain a minimum speed within 20 MPH of the posted truck speed. When encountering steep grades where a minimum speed within 20 MPH of the posted truck speed cannot be maintained, the combination of vehicles shall activate four-way flashers. Horsepower must be adequate to maintain a minimum speed of 20 MPH except on grades the Chief Engineer deems are impractical.