Stairwell Evacuation Study Finds 'What We Know We Don't Know'

Most of the time, we use the stairs in buildings - especially in high-rise structures - only as a back-up for faster elevators and escalators, but during a fire or other emergency, stairs become our primary passage to survival. In a new study, researchers at NIST examined what we know about how stairs work as an emergency evacuation route and found that the answer is ... not nearly enough.

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