What is the purpose of emergency exits on a bus?

The purpose of emergency exits on a bus is to provide an alternative way out in case of an emergency. These exits are strategically designed to ensure passenger safety by allowing for quick egress when regular doors may not be accessible, such as during a fire, accident, or other hazardous situations. They are typically marked and equipped to facilitate rapid evacuation, which is crucial for the safety of all passengers, especially children who may not be able to effectively use standard exits in a panic.

The other options do not align with the fundamental purpose of emergency exits. Ventilation is typically managed through standard windows and vents, loading and unloading luggage is handled at designated points usually not meant for emergencies, and driver access only pertains to operational aspects rather than evacuation needs. Therefore, the correct choice emphasizes the essential role of emergency exits as critical life-saving features on school buses.