ORS 801.194 "Class III All-Terrain Vehicle" and "Class IV All-Terrain Vehicle."

(1) "Class III all-terrain vehicle" means a motorcycle that travels on two tires and that is actually being operated off highway.

(2) "Class IV all-terrain vehicle" means any motorized vehicle that:

(a) Travels on four or more pneumatic tires that are six inches or more in width and that are designed for use on wheels with a rim diameter of 14 inches or less;

(b) Is designed for or capable of cross-country travel on or immediately over land, water, sand, snow, ice, marsh, swampland or other natural terrain;