Off-highway vehicles

(A) Off-highway transportation vehicles (i) In general A vehicle shall not be treated as a highway vehicle if such vehicle is specially designed for the primary function of transporting a particular type of load other than over the public highway and because of this special design such vehicle’s capability to transport a load over the public highway is substantially limited or impaired. (ii) Determination of vehicle’s design For purposes of clause (i), a vehicle’s design is determined solely on the basis of its physical characteristics. (iii) Determination of substantial limitation or impairment For purposes of clause (i), in determining whether substantial limitation or impairment exists, account may be taken of factors such as the size of the vehicle, whether such vehicle is subject to the licensing, safety, and other requirements applicable to highway vehicles, and whether such vehicle can transport a load at a sustained speed of at least 25 miles per hour. It is immaterial that a vehicle can transport a greater load off the public highway than such vehicle is permitted to transport over the public highway.

(B) Nontransportation trailers and semitrailers A trailer or semitrailer shall not be treated as a highway vehicle if it is specially designed to function only as an enclosed stationary shelter for the carrying on of an off-highway function at an off-highway site.