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A
Only when the bus is on fire
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B
When remaining on the bus is more dangerous than evacuating — fire or smoke, hazardous material leak, structural damage threatening collapse, being in water or at risk of entering water, or if the bus is blocking traffic in a dangerous location with no ability to move
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C
Only when a student requests evacuation
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D
Only under direct instruction from dispatch
Why this is the answer
EMERGENCY EVACUATION DECISION requires rapid judgment: which is more dangerous — staying on the bus or evacuating? EVACUATE WHEN: FIRE or SMOKE on the bus — any fire on a school bus is cause for immediate evacuation; school bus fires can accelerate extremely rapidly; post-crash fire is a specific scenario that requires immediate evacuation even if students appear uninjured; HAZARDOUS MATERIAL exposure — chemical spill on or near the bus creates inhalation risk that may be worse inside the enclosed bus; IMMINENT COLLAPSE RISK — the bus has suffered structural damage in an accident that threatens the roof or sides; WATER — the bus is in water or sinking; occupants must be out before water enters the bus; DANGEROUS TRAFFIC EXPOSURE — the bus cannot be moved and is blocked on active highway lanes creating high rear-end crash risk, and evacuation can be done to a safer location. DO NOT EVACUATE WHEN: The location outside is MORE dangerous than remaining in the bus — busy highway lanes, hazardous materials outside, severe weather without shelter; in these cases, stay in the bus and call for emergency assistance; EVACUATION PROCEDURE: Assign students to exits; open emergency doors; assist younger/special-needs students first; deploy evacuation triangle marker; designate an older student to direct students away from the bus to a safe assembly point; driver exits last; account for all students; call 911.
Source: FMCSA CDL Manual, Chapter 12, School Buses, Emergency Evacuation Decision