Pennsylvania - Transportation Safety—safety equipment: Program Requirement
The Pennsylvania Code § 171.68. Seat belts.
(b) Seat belts for the driver and all other designated seating positions. Every Type A school bus shall be equipped with an integral Type 2 seat belt assembly at the driver's designated seating position and at the right front passenger's designated seating position, if any. All other designated seating positions shall have a Type 1 or Type 2 seat belt assembly. Seat belt assemblies shall comply with FMVSS Nos. 208, 209 and 210 -- See Appendix A.