No bus shall be equipped with aisle seats unless such seats are so designed and installed as to automatically fold and leave a clear aisle when they are unoccupied. No bus shall be operated if any seat therein is not securely fastened to the vehicle.
[53 FR 49402, Dec. 7, 1988]
source: 33 FR 19735, Dec. 25, 1968, unless otherwise noted.
cite as: 49 CFR 393.91