Special mobile equipment

"Special mobile equipment" means a vehicle that is not designed or used primarily to transport persons or property and that is only incidentally operated on a highway. The term: (A) includes ditchdigging apparatus, well boring apparatus, and road construction and maintenance machinery, including an asphalt spreader, bituminous mixer, bucket loader, tractor other than a truck tractor, ditcher, levelling grader, finishing machine, motor grader, road roller, scarifier, earth-moving carryall and scraper, power shovel or dragline, or self-propelled crane and earth-moving equipment; and (B) excludes a vehicle that is designed to transport persons or property and that has machinery attached, including a house trailer, dump truck, truck-mounted transit mixer, crane, and shovel.