Under which circumstance should a bus be evacuated?

Evacuating a bus is a critical safety procedure that is primarily warranted in emergencies. The circumstance that necessitates evacuation is the presence of smoke or fire. This situation poses an immediate danger to the safety of all passengers and crew, as smoke can impair visibility and breathing, while a fire can escalate quickly, threatening the lives of everyone on board.

In such cases, prompt action is essential to ensure that everyone can safely exit the bus. Evacuation helps to minimize the risk of injury or fatality, making it a vital response to any signs of smoke or fire. Adhering to safety protocols in such circumstances helps to ensure that all passengers can escape to safety as quickly and efficiently as possible.

Other situations, such as passenger requests, being at a terminal, or heavy traffic, do not inherently require evacuation. They may involve considerations for comfort or convenience but do not present the same level of immediate peril that necessitates an urgent evacuation.