As used in this section and KRS 186.752:
(1) "Bi-fuel system" means the power system of motor vehicles that are powered by gasoline and either CNG or LNG;
(2) "Cabinet" means the Transportation Cabinet;
(3) "Clean transportation fuel" means:
(a) Propane, CNG, LNG, bi-fuel systems, or electricity when they are used as motor vehicle fuel; or (b) Other transportation fuels determined by the division to be comparable with respect to emissions;
(4) "Compressed natural gas" or "CNG" means pipeline quality natural gas that is compressed and provided for sale or use as a motor vehicle fuel;
(5) "Conversion" means:
(a) Repowering a motor vehicle or special mobile equipment by replacing its original gasoline or diesel powered engine with one capable of operating on clean transportation fuel; or (b) Retrofitting a motor vehicle or special mobile equipment with parts that enable its original gasoline or diesel powered engine to operate on clean transportation fuel;
(6) "Division" means the Division for Air Quality within the Energy and Environment Cabinet;
(7) "Liquefied natural gas," "liquid natural gas," or "LNG" means pipeline-quality natural gas treated to remove water, hydrogen sulfide, carbon dioxide, and other components that will freeze and condensed into liquid form for sale or use as a motor vehicle fuel;
(8) "Liquefied petroleum gas," "propane," or "LPG" means a hydrocarbon mixture produced as a by-product of natural gas processing and petroleum refining and condensed into liquid form for sale or use as a motor fuel;
(9) "Motor vehicle" means a self-propelled device by which a person or property may be transported upon a public highway, except a device moved by human or animal power or used exclusively upon stationary rails or tracks, or which derives its power from overhead wires; and (10) "Special mobile equipment" means a motor vehicle or mobile equipment not designed or used primarily to transport people, including but not limited to construction or maintenance equipment.