Mobile source
Mobile source means a motor vehicle, nonroad engine or nonroad vehicle, where:
(1) A motor vehicle is any self-propelled vehicle used to carry people or property on a street or highway;
(2) A nonroad engine is an internal combustion engine (including fuel system) that is not used in a motor vehicle or a vehicle used solely for competition, or that is not affected by sections 111 or 202 of the CAA; and
(3) A nonroad vehicle is a vehicle that is run by a nonroad engine and that is not a motor vehicle or a vehicle used solely for competition.