(A) The required rear emergency door is inoperable from the interior due to a retracted wheelchair loading device.

(B) The vehicle is equipped with a right side floor-level emergency door located to the rear of the driver's seat.

(C) The alternate exit consists of not more than two windows each having a minimum opening dimension of 12 in. and a combined total area of at least 564 in. Such exits need be identified and operable only from the bus interior.

(A) An emergency passageway with a width of not less than 9 in. shall provide access to each wheelchair station from both the door used to load and unload the wheelchairs and to the floor level emergency exit door required by this section. A wheelwell will not be considered an obstruction for the purposes of this subsection.

(B) Notwithstanding subsection (A), an aisle shall be provided as wide as necessary to effect a rapid evacuation of any wheelchair containing a pupil during an emergency and shall provide access to each wheelchair from both the door used to load and unload the wheelchairs and to the floor level emergency exit door required by this section. An aisle is not considered obstructed if the only obstruction is another wheelchair that can be readily removed.

(A) Webbed safety belts shall meet or exceed federal specifications for Type 2 pelvic restraint seat belts or be certified by the manufacturer to meet or exceed assembly strengths of 5,000 lb in loop fashion or 2,500 lb on each anchorage leg. Certification may be the manufacturer's specifications listed in catalogs or publications. All new construction of webbed fasteners and repairs to webbing shall conform with standards established by the manufacturer of the webbing. Webbed belts attached directly to the vehicle and securement track used for webbed fastener attachments shall be secured to the vehicle at not less than two separate points with bolts, nuts, and lock washers or self-locking nuts. Bolts used shall provide holding strength equal to or greater than that of two bolts ⅜ in. in diameter and of National Fine Thread SAE grade 5. All fastening of webbing and securement tracks shall be in accordance with the manufacturer's specifications provided that no standard established herein may be violated. Where mounting bolts do not pierce the vehicle frame, subframe, body posts, or equivalent metal structure, a reinforcement plate or washer not less than ¹/₁₆ in. in thickness and 2 ½ in. in diameter is required. Smaller diameter washers may be used to install wheelchair securement track provided a minimum of four fasteners and four washers are used for each track installation. These washers shall be not less than 1 ¼ in. in diameter, not less than ¹/₁₆ in. in thickness, and have an appropriate inside diameter. In no event shall interior paneling constitute anchorage for a point of securement. When not in use, webbed belts shall be removed or retracted.

(B) All-metal fasteners shall be secured to the vehicle with bolt nuts and lock washers or self-locking nuts of National Fine Thread SAE grade 5 or equivalent. Such devices shall have two points of securement requiring bolts ⅜ in. in diameter or equivalent, or one point of securement requiring a bolt of ½ in. in diameter or equivalent. Where mounting bolts do not pierce the vehicle frame, subframe, body post, or equivalent metal structure, a reinforcement plate or washer not less than ¹/₁₆ in. in thickness x 2 ½ in. in diameter is required. In no event shall interior paneling constitute anchorage for a point of securement.