A nice design feature of subway turnstiles in Japan is that they are open by default. They only close if you try to pass through without a ticket. Subjectively, it conveys trust. Objectively, it probably results in less maintenance because the parts move much less frequently. 
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A good publicly discussed example of this is vending machines, which are private infrastructure *except* during severe distress, when their manufacturers/owners deem them public infrastructure. They're built with a procedure to defeat the payment gate. It's broadcast at need.
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(The general shape is "For an X brand machine, the top right corner of the display is actually paper. Stick any sharp instrument through it, then pull forward with moderate force. The front display will come off, exposing the cans. Take what is necessary.")
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interesting. if they fail open - as in open to pass through - it means it's safer for people who might need to get out in case of a safety. Is that the design constraint?
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I am speculating without specific knowledge but I feel reasonably confident in this speculation.
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