Slightly related, but there is a paper in a mathematical journal that looks at how ingress and egress is improved by putting a barrier in the middle of the doorway. If there is no barrier, people will simply shove in the 'me first' style. When there is a barrier (e.g a pillar in the way) they will file out in a more orderly fashion, and everyone actually exits faster, and the room in emptied in less time. It apparently applies to particles too.
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