Iowa Admin. Code r. 571-50.1
"All-terrain vehicle" means a motorized flotation-tire vehicle with not less than three and not more than six low-pressure tires that is limited in engine displacement to less than 1,000 cubic centimeters and in total dry weight to less than 1,000 pounds and that has a seat or saddle designed to be straddled by the operator and handlebars for steering control.
"Off-road motorcycle" means a two-wheeled motor vehicle that has a seat or saddle designed to be straddled by the operator and handlebars for steering control and that is intended by the manufacturer for use on natural terrain. "Off-road motorcycle" includes a motorcycle that was originally issued a certificate of title and registered for highway use under Iowa Code chapter 321, but which contains design features that enable operation over natural terrain.
"Off-road utility vehicle" means a motorized flotation-tire vehicle with not less than four and not more than eight low-pressure tires that is limited in engine displacement to less than 1,500 cubic centimeters and in total dry weight to not more than 1,800 pounds and that has a seat that is of bucket or bench design, not intended to be straddled by the operator, and a steering wheel or control levers for control. A motorized vehicle that was previously titled or is currently titled under Iowa Code chapter 321 shall not be registered or operated as an off-road utility vehicle.
"Regulated vehicle" means all-terrain vehicles, off-road motorcycles, and off-road utility vehicles, either collectively or individually. For purposes of this chapter only, "regulated vehicle" shall also include a snowmobile.
"Snowmobile" means a motorized vehicle weighing less than 1,000 pounds which uses sled-type runners or skis, endless belt-type tread with a width of 48 inches or less, or any combination of runners, skis, or tread, and is designed for travel on snow or ice. "Snowmobile" does not include an all-terrain vehicle which has been altered or equipped with runners, skis, belt-type tracks, or treads.
"Vessel" means every description of watercraft, other than a seaplane, used or capable of being used as a means of transportation on water or ice. Ice boats are watercraft.
"Watercraft" means any vessel which through the buoyant force of water floats upon the water and is capable of carrying one or more persons. Docks, defined and regulated by 571-Chapter 16, are not watercraft.
Iowa Admin. Code r. 571-50.1