When a bus has automatically folding aisle seats, how many may remain extended while unoccupied?
Correct answer: A. – 0
A folding aisle seat must be designed and installed to fold automatically and leave a clear aisle whenever it is unoccupied. Consequently, no unoccupied aisle seat may remain extended into the aisle. Federal equipment rules also require every bus seat to be securely fastened to the vehicle.
Source: 49 CFR § 393.91 — Buses, Aisle Seats Prohibited

