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States often use different terms to define Off Highway Vehicles (OHV) or All-Terrain Vehicles (ATV).
In Oregon, laws were written using the term All-Terrain Vehicle which encompasses all types of vehicles including motorcycles, 3 wheelers, quads, side-by-sides, sand rails, trucks and SUVs.
There are legal definitions for each type of vehicle and the rules can be different for each for things such as age of operator and where each type of vehicle can be driven. See below for the specific rules.
Operators with a suspended or revoked driver's license may not operate any Class of ATV.
Class I ATVs are known as four-wheelers, quads, 3-wheelers. They can be 2 or 4 wheel drive. They also include 6x6 ATVs. Polaris Ace is considered a Class IV since it has a steering wheel and seat.
Class II ATVs include pickup trucks, SUVs, Jeeps, rock crawl vehicles and sand rails. They may be street legal or for off-highway use only.
If a side-by-side or quad does not meet the definition of their category, such as after installing tracks, then they become a Class II vehicle.Operator requirements:
If a ski and tracks are installed for use in the snow, then the vehicle becomes a snowmobile and needs a snowmobile title and registration.
Class IV ATVs are commonly known as side-by-sides. Basically they have a steering wheel, non-straddle seat and roll cage. The industry produces Recreational Off-Highway Vehicle (ROV) and Utility Task Vehicle (UTV) and they both are considered Class IV ATVs.ROVs have a max speed of 30mph. The single seat Polaris Ace is also a Class IV. Land managers may designate trails by width and limit side-by-sides by 50 or 65 inches due to narrow bridges or tight trees.
Defined: ORS 801.194
Operator requirements (applies only to public OHV riding areas):
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