“Ski area vehicles” shall mean motor vehicles, except private passenger vehicles, whether wheeled or tracked, on-highway or off-highway, owned or leased by a ski area as defined in N.H. Rev. Stat. § 225-A:2, VIII, and used exclusively in winter or summer maintenance of ski trails, parking lots, private access roads, structures and other ski area facilities. These vehicles shall include snow cats, snow dozers, snow grooming equipment and tractors, except that it shall not include vehicles with metal tracks or cleats operated outside the bounds of any road maintained exclusively by the ski area.