School buses, vehicles which are under contract with or owned by a school district or a private or parochial school, including vehicles having chartered group and party rights under the Public Utility Commission and used to transport school students; passenger vans used to transport persons for hire or owned by a commercial enterprise and used for the transportation of employees to or from their place of employment; mass transit vehicles and motor carrier vehicles with a registered gross weight in excess of 17,000 pounds, other than farm vehicles for which a biennial certificate of exemption has been issued shall be subject to semiannual inspection.
67 Pa. Code § 175.5
The provisions of this §175.5 amended under the Vehicle Code, 75 Pa.C.S. §§ 4103, 4301, 4501, 4521 and 6103.
This section cited in 67 Pa. Code § 257.3 (relating to certificate of inspection).