67 Pa. Code § 97.2
The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise:
Agricultural vehicle-A vehicle used primarily in connection with cultivating the soil, or raising or harvesting an agricultural or horticultural commodity, including the raising, shearing, feeding, caring for, training and management of livestock, bees, poultry and fur-bearing animals and wildlife. As used in this definition "primarily" means more than 1/2 of all mileage.
Applicant-A person, as defined in 75 Pa.C.S. § 102 (relating to definitions), in whose name application for vehicle registration is filed.
Bureau-Bureau of Motor Vehicles of the Department of Transportation.
Heavy vehicle use tax-A tax imposed by the United States (Pub. L. 97-424, 96 Stat. 2177) on vehicles with a taxable gross weight of at least 55,000 pounds.
Logging vehicle-A vehicle used exclusively to transport products harvested from a forested site, which may include timber which has been processed for commercial use by sawing into lumber, chipping or other milling operations if the processing occurs prior to transportation from the forested site.
Registered gross weight-The maximum gross weight at which a vehicle or combination is registered in this Commonwealth to operate on a highway.
Taxable gross weight-The sum of:
Vehicle-A truck, truck tractor or bus with a registered gross weight of at least 55,000 pounds.
67 Pa. Code § 97.2