A bus is stopped near a hazardous materials spill from a nearby accident but is not in immediate danger of fire or collision. Per the CDL Manual's evacuation risk-assessment guidance, what must the driver weigh before deciding whether to evacuate?

AAMVA CDL Manual, Section 10.3.1 – Planning for Emergencies, p. 10-6

Not every hazard outside the bus means students are safer leaving it — sometimes the bus itself is the safest shelter available. This factor forces the driver to actually compare the danger inside versus outside before acting.