TYPE C: A "Type C" school bus is a body installed upon a flat back cowl chassis or an integrated conventional chassis/body combination, with a hood and front fender assembly and a gross vehicle weight rating of more than ten-thousand pounds (10,000 lbs.). The engine is in front of the windshield and the entrance door is behind the front wheels. This type is also known as a "conventional school bus”. A Type C bus is defined in the “Minimum Chassis Specifications Chart Type C bus, page B-8
TYPE D: A "Type D" school bus is a body installed upon a chassis, with the engine mounted in the front, mid bus, or rear with a gross vehicle weight rating of more than ten thousand pounds (10,000 lbs), The engine may be behind the windshield and beside the driver's seat; it may be at the rear of the bus, behind the rear wheels; or between the front and rear axles. The entrance door is ahead of the front wheels. This type is also known as "transit-style school bus". The Type D bus is defined in the “Minimum Chassis Specifications Chart Type D bus, page B- 9.
BUSES FOR STUDENTS WITH DISABILITIES: Equipping buses to accommodate students with disabilities is dependent upon the needs of the passengers. While one bus may be fitted with a lift, another may have child passenger restraint systems. Buses so equipped are not to be considered a separate class of school bus, but simply a regular school bus that is equipped for special accommodations. Buses equipped for students with disabilities shall meet all the requirements of the chassis and body sections as well.
As defined by the Code of Federal Regulations (CFR) 49§ 571.3, "Bus means a motor vehicle with motor power, except a trailer, designed for carrying more than ten persons" (eleven or more including the driver). This definition also embraces the more specific category, school bus. Vehicles with 10 or fewer passenger positions (excluding the driver) cannot be classified as buses. Manufacturers must use the federal vehicle classification of multipurpose passenger vehicle (CFR 49 § 571.3, or MPV) in lieu of the school bus classification. This classification system does not preclude state or local agencies or the national specifications from requiring compliance of school bus-type MPVs with the more stringent federal or state standards for school buses. If by addition of a power lift, mobile seating device positions or other modifications, the capacity is reduced such that vehicles become MPVs, the intent of these specifications is to require these vehicles to meet the same specifications they would have had to meet prior to such modifications, and such MPVs are included in all references to school buses and requirements for school buses which follow.
For Vehicle Class Only: In determining the passenger capacity of a school bus for purposes other than actual passenger load (e.g., vehicle classification or various billing/reimbursement models), any location in a school bus intended for securement of an occupied wheelchair/mobility aid during vehicle operations is