75 Pa. C.S. § 4102
The following words and phrases when used in this part shall have, unless the context clearly indicates otherwise, the meanings given to them in this section:
"Centralized inspection." A system for vehicle emission inspection utilizing consolidated facilities owned and operated by the Commonwealth or by a contractor or contractors to the Commonwealth that provide for vehicle emission testing only.
"Decentralized inspection." A system for vehicle emission inspection using privately owned and operated department-certified facilities to provide for vehicle emission testing or allowing for repairs or both.
"Enhanced emission inspection program." A vehicle emission inspection program as defined by the Federal Environmental Protection Agency and including, but not limited to, computerized emission analyzers, on-road testing and inspection of vehicle emission control devices through a contracted centralized or decentralized inspection program.
"Federal standard." A minimum standard of vehicle or vehicle equipment performance issued under the National Traffic and Motor Vehicle Safety Act (80 Stat. 718, 15 U.S.C. § 1381 ), the Motor Vehicle Information and Cost Savings Act (86 Stat. 947, 15 U.S.C. § 1901 ) or the Clean Air Act (81 Stat. 485, 42 U.S.C. § 1857 ).
"On-road testing device." An exhaust gas analyzer capable of measuring vehicle exhaust gas content outside of the garage environment while the vehicle is in motion on the road or at roadside.
"Qualified Commonwealth employee." An individual, police officer or qualified department employee who has completed training in the inspection or weighing of vehicles as required by section 4704 (relating to inspection by police or Commonwealth personnel), 4981 (relating to weighing and measurement of vehicles) or 8302 (relating to powers and duties of department).
"Subject vehicle." A motor vehicle having a gross vehicle weight rating of 9,000 pounds or less which is of a model year and uses a type of fuel specified by regulation of the department if the secretary certifies by publication in the Pennsylvania Bulletin that an emission inspection program for such vehicles is required to meet the attainment goals established by the Clean Air Act ( Public Law 95-95, 42 U.S.C. § 7401 et seq.), as amended, and regulations promulgated by the United States Environmental Protection Agency.
"Vehicle equipment standard." A minimum standard for vehicle performance or vehicle equipment performance which meets the needs of vehicle safety, noise control or air quality control, which is practicable and which provides objective criteria.
75 Pa.C.S. § 4102