A news item on TV this evening reminded me that building designs may fail to prioritize evacuation, and that laws enacted after designs get implemented may be equally likely to fail to make evacuation feasible in existing buildings, whether there are natural or human impacts, for example: earthquakes or missiles; that threaten building occupants.
The following mind map represents consequential impacts on stairwells, rather than superstructures, without taking into account variation in individual or planned evacuation speeds; which depend in turn upon immediate floor-level casualties, and willingness of non-casualties to engage in near-peer evacuations.
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