Type A

The Type A school bus consists of a bus body constructed upon a cutaway front-section vehicle with a left side driver's door, designed for carrying more than 10 persons. This definition includes two classifications: Type A-I, with a Gross Vehicle Weight Rating (GVWR) of 10,000 pounds or less, and a Type A-2, with a GVWR of 10,000 pounds or more. Type A school buses meet all Federal Motor Vehicle Safety Standards for school buses.

The Type B school bus consists of a bus body constructed and installed upon a front-section vehicle chassis, or stripped chassis, with a gross vehicle weight rating of more than 10,000 pounds, designed for carrying more than 10 persons. Part of the engine is beneath and/or behind the windshield and beside the drivr's seat. The entrance door is behind the front wheels. Type B school buses meet all Federal Motor Vehicle Safety Standards for school buses.

Type C

The Type D school bus, also known as a transit-style, is a body installed upon a chassis, with the engine mounted in the front, midship, or rear with a gross vehicle weight rating of more than 10,000 pounds, and designed for carrying more than 10 persons. 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 midship between the front and rear axles. The entrance door is ahead of the front wheels. Type D school buses meet all Federal Motor Vehicle Safety Standards for school buses. [Editor's note: Type D school buses are referred to as RE for "rear-engine," and FC for "forward control."]

A Multifunction School Activity Bus is defined as a vehicle sold for purposes that do not include transportation between home and school for K-12 students. Since they are not intended to be used for picking up or discharging students on public roadways the MFSAB is exempt from the traffic control requirements and devices - stop arm, flashing lights - designed to control traffic. While the MFSABs are exempt from the traffic control requirements, they are required to comply with all school bus crashworthiness standards, all requirements in the school bus crash avoidance and conspicuity safety standards, and all post-crash school bus standards. Schools and school districts are specifically prohibited from using MFSABs to transport school children in regular route school bus transportation service.

An Alowable Alternate Vehicle meets all federal school bus crashworthiness standards, but does not meet conspicuity regulations or traffic control standards, i.e. flashing red lights, school bus yellow paint, and left side stop arm.

AAV

A school van is a regular van converted to full school bus specifications. Major alterations are made to the vehicle including cutting the roof off and welding in a full roll cage, along with dozens of other major alterations. When complete, the vehicle rides like a regular van, but meets the Federal Motor Vehicle Safety Standards for school buses.