ATV: A small, open motor vehicle having one seat and three or more wheels fitted with large tires. It is designed chiefly for recreational use over roadless, rugged terrain
All-terrain vehicle - 42" width or smaller A small, amphibious motor vehicle with wheels or tractor treads for traveling over rough ground, snow, or ice, as well as on water
An engine-driven device which has a net weight of 650 pounds or less, which has a width of 48 inches or less, which is equipped with a seat designed to be straddled by the operator and which is designed to travel on 3 or more low-pressure tires (Ref 4)
Any motorized non-highway vehicle 45 inches or less in width, having a dry weight of 650 pounds or less, traveling on three or more low-pressure tires, and having a seat to be straddled by the operator As used in this subsection, "low pressure tire" means any pneumatic tire six inches or more in width, designed for use on wheels with rim diameter of 12 inches or less, and utilizing an operating pressure of 10 pounds per square inch or less as recommended by the vehicle manufacturer