No person shall drive a bus and a motor carrier shall not require or permit a person to drive a bus unless--
(a) All standees on the bus are rearward of the standee line or other means prescribed in Sec. 393.90 of this subchapter;
(b) All aisle seats in the bus conform to the requirements of Sec. 393.91 of this subchapter; and
(c) Baggage or freight on the bus is stowed and secured in a manner which assures--
(1) Unrestricted freedom of movement to the driver and his proper operation of the bus;
(2) Unobstructed access to all exits by any occupant of the bus; and
(3) Protection of occupants of the bus against injury resulting from the falling or displacement of articles transported in the bus. [63 FR 33278, June 18, 1998]