(a) Bus Driver's Seat. The driver's seat shall be positioned so that the driver may assume a natural position while driving and have a clear view of the road and mirrors and sufficient leg room to operate the brake, clutch, and accelerator pedals and all other controls without cramping or interference. The driver's seat shall be readily adjustable backward and forward and may be adjustable up and down or may incorporate up and down motion with forward and backward adjustability. On school buses and school pupil activity buses, the driver's seat shall also be equipped with a locking device to prevent accidental separation of the adjustable seat components. In addition, a safety belt meeting the provisions of FMVSS 209 shall be provided for the driver in school buses and school pupil activity buses.

(b) Bus Passenger Seats. Jump seats and seats in aisles shall not be permitted in any bus. Seats in school pupil activity buses shall be adequately secured and shall provide a seating space at least 13 inches wide for each passenger.