What distinguishes a Type "D" school bus from other types?

A Type "D" school bus is specifically designed with its entrance door located ahead of the front wheels. This design is significant for several reasons, primarily related to safety and accessibility. By positioning the entrance door in front of the front wheels, the bus ensures that students boarding and exiting the vehicle have a clear path that is away from the danger zone created by the wheels.

This layout also contributes to the structural integrity and overall design of the bus, allowing for a larger passenger compartment while maintaining safe operation. The emphasis on safety in school bus design is critical since these vehicles transport children, and the manufacturer's choices in bus design reflect adherence to strict regulations and standards.

The other options include details that do not accurately describe the distinguishing features of a Type "D" school bus. For example, the location of the entrance door is a crucial differentiator, establishing how Type "D" buses are easily recognized and distinguished from other bus types.