ORS 801.190: “Class I all-terrain vehicle.”

“Class I all-terrain vehicle” means a motorized, off-highway recreational vehicle that:

      (1) Is 50 inches or less in width;

      (2) Has a dry weight of 1,200 pounds or less;

      (3) Travels on three or more tires designed for off-road use only;

      (4) Uses handlebars for steering;

      (5) Has a seat designed to be straddled for the operator; and

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