Oregon Revised Statutes Oregon Vehicle Code § 811.485

(a) Drives a motor vehicle so as to follow another vehicle more closely than is reasonable and prudent, having due regard for the speed of the vehicles and the traffic upon, and condition of, the highway.

(b) Drives a truck, commercial bus or motor vehicle drawing another vehicle when traveling upon a roadway outside of a business or residence district or upon a freeway within the corporate limits of a city and follows another truck, commercial bus or motor vehicle drawing another vehicle without, when conditions permit, leaving sufficient space so that an overtaking vehicle may enter and occupy the space without danger. This paragraph does not prevent a truck, commercial bus or motor vehicle drawing another vehicle from overtaking and passing a vehicle or combination of vehicles.

(c) Drives a motor vehicle when traveling upon a roadway outside of a business or residence district or upon a freeway within the corporate limits of a city in a caravan or motorcade whether or not towing another vehicle without operating the vehicle so as to leave sufficient space between vehicles to enable a vehicle to enter and occupy the space without danger.