35 Pa. Stat. § 4602
The following words and phrases when used in this act shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Bus." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"Bus depot." A location where buses are routinely kept overnight, including any garage structure or outdoor bus parking area or both.
"Department." The Department of Environmental Protection of the Commonwealth.
"Diesel-powered." A type of engine that has operating characteristics significantly similar to the theoretical diesel combustion cycle.
"Farm equipment." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"Farm vehicle." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"Highway." The term as it is defined under 49 CFR 390.5 (relating to definitions).
"Idle reduction technology." Any device or system of devices that is installed on a motor vehicle subject to this act and is designed to provide it those services, such as heat, air conditioning and electricity, that would otherwise require the operation of the main drive engine while the motor vehicle is temporarily parked or remains stationary.
"Idling." Operation of the main propulsion engine of a motor vehicle while the vehicle is stationary.
"Implement of husbandry." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"Motor home." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"Motor vehicle." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"School bus." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"School vehicle." As defined under 75 Pa.C.S.§ 102 (relating to definitions).
"Stationary idle reduction technology." Equipment that transforms power from the electric grid for the purpose of delivering usable electric power, heat or air conditioning to a motor vehicle for the purpose of reducing main engine idling.
35 P.S. § 4602