75 Pa. C.S. § 9602
The following words and phrases when used in this chapter and in Chapter 21 (relating to motor carriers road tax identification markers) shall have the meanings given to them in this section and in section 2101.1 (relating to definitions) unless the context clearly indicates otherwise:
"Department." The Department of Revenue of the Commonwealth.
"Highway." The Pennsylvania Turnpike and every way or place, of whatever nature, open to the use of the public as a matter of right for purposes of vehicular travel. The term does not include a roadway or driveway upon grounds owned by private persons, colleges, universities or other institutions.
"Motor carrier." Every person who operates or causes to be operated any qualified motor vehicle on any highway in this Commonwealth.
"Motor fuel." Includes "fuels," "liquid fuels" and "alternative fuels" as defined in section 9002 (relating to definitions).
"Operations." Operations of all qualified motor vehicles, whether loaded or empty, whether operated singly or in combination with trailers or semitrailers, whether for compensation or not for compensation, and whether owned by or leased to the motor carrier who operates them or causes them to be operated.
"Qualified motor vehicle." As defined in section 2101.1 (relating to definitions).
"Recreational vehicle." Vehicles such as motor homes, pickup trucks with attached campers and buses when used exclusively for personal pleasure by individuals. In order to qualify as a recreational vehicle, the vehicle shall not be used in connection with any business endeavor.
"Secretary." The Secretary of Revenue of the Commonwealth.
75 Pa.C.S. § 9602