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A comment on Our vendor executed a system reboot that caused a shut down of the turnstiles. Parent comment

Re:Our vendor executed a system reboot that caused a shut do... by londons_explore on Tuesday May 18, 2021 @02:41AM (#27191857)
Fail open has safety implications in the case of overcrowding.

Many systems use the turnstiles as a way to prevent overcrowding and people being pushed onto the metro tracks or killed by a human-crush.

Failing open in that case could be deadly.

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Re:Our vendor executed a system reboot that caused a shut do... by baud147258 on Tuesday May 18, 2021 @06:28AM (#27192983)
in Paris, the turnstiles prevent passage when closed, so it would prevent people from using the metro if it defaulted to close in case of failure. And I don't think it's used to prevent overcrowding, just regulate the flow
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