2006 New York Code - Motor Vehicles.

 
    § 125. Motor vehicles.  Every vehicle operated or driven upon a public
  highway  which  is  propelled  by  any  power other than muscular power,
  except (a) electrically-driven mobility assistance devices  operated  or
  driven  by  a person with a disability, (b) vehicles which run only upon
  rails or tracks, (c) snowmobiles as defined in  article  forty-seven  of
  this  chapter,  and  (d)  all  terrain  vehicles  as  defined in article
  forty-eight-B of this chapter.  For the purposes of title four, the term
  motor  vehicle  shall  exclude  fire  and  police  vehicles  other  than
  ambulances.  For  the  purposes  of  titles four and five the term motor
  vehicles shall exclude farm type tractors and all terrain type  vehicles
  used  exclusively  for agricultural purposes, or for snow plowing, other
  than for hire, farm equipment, including  self-propelled  machines  used
  exclusively  in  growing,  harvesting  or  handling  farm  produce,  and
  self-propelled  caterpillar  or  crawler-type  equipment   while   being
  operated on the contract site.