9 ms·
In Paris there are similar turnstiles, but when there's a problem, the default is opened, not closed. It makes absolutely no sense, because the main thing is t
by aneutron 5y ago
In Paris there are similar turnstiles, but when there's a problem, the default is opened, not closed.
It makes absolutely no sense, because the main thing is to keep the traffic moving, not to engorge it.
- VWWHFSfQ 5y agoThe turnstiles in NYC are set to fail open as well unless manually overriden. It seems someone did that, for some reason. Possibly incompetence.
- throwaway0a5e 5y ago"client called and complained about lost revenue when we did it the way that's specified in our documentation so we're gonna put a note in the checklist to override it going forward"
- optimalsolver 5y agoSeems like not having them open would be disastrous in an emergency scenario.
- deleted 5y ago[deleted]
- wil421 5y agoUsually here are gates with a fire alarm next to them so you bypass them when needed.
- jrockway 5y agoYou don't pay a fare to exit the New York City Transit system, so nothing will prevent you from leaving during a fire; control system failure or otherwise. There are also emergency exit doors (that many people open to exit more quickly in normal operation of the subway). One may argue that having to go through a turnstile at all is an evacuation disaster, but presumably the designers thought about this and the exit doors are adequate in an emergency. This is different than systems like London and Tokyo, where you pay for the distance you traveled, and a station evacuation mandates opening the fare controls to let people exit more quickly. For better or for worse, that option has never existed in New York.
- alias_neo 5y agoIt's been a while...lockdown...so I'm recalling memories from ~ 1 year ago, the last time I used the tube (I live in London), but if I remember right, each gate has a red emergency stop button you can hit to exit in an emergency.
- tialaramex 5y agoEr. No? Gate lines in the UK are manned, if there isn't someone available to supervise the gate line, the gates are left open. There is no "red emergency stop button" on the gates. Perhaps if the maintenance controls are open there's a red button inside somewhere, but that's not what it's for. Most likely you're remembering other emergency stop buttons you saw, e.g. on escalators or in lifts?
- alias_neo 5y agoI must be remembering the escalator ones, that makes more sense.
- Animats 5y agoThere are red emergency open buttons for the gateline operator. Here is where they are, in the London Underground training video for gateline operators.[1] [1] https://youtu.be/lRdkI09KCpk?t=220 https://youtu.be/lRdkI09KCpk?t=220
- tialaramex 5y agoTrue, but those aren't controls on the gate. I guess I should have mentioned them in my list of other places the grand-parent might have seen red emergency stop buttons.
- Dort 5y agoI think an emergency could also require someone going in, like ambulance crew or firefighters and the likes.
- papito 5y agoThat sounds like correct behavior to me.
- deleted 5y ago[deleted]
- Nextgrid 5y agoI'm not sure this is a manual override. Most likely, they didn't "fail" - the control system was holding them closed for some reason but this wasn't a failure scenario. I'm sure they would correctly fail open if the power was cut or the fire alarm was triggered.
- avs733 5y agofrom the tweet "NYPD say no access"
- CydeWeys 5y agoOne key thing that a lot of people seem to be missing in this conversation: The turnstiles rotate in two directions, inwards and outwards. They always freely rotate outwards, so every turnstile can always be used to exit the system. They are always locked against inwards rotation, except for when you swipe your Metrocard, then they perform one partial rotation to admit you. The linked photo shows someone who is being denied entry into the system, i.e. payments cannot be made and thus that one partial inwards rotation cannot happen. Outwards rotation, however, remains unaffected; if they were on the other side of the turnstile, they wouldn't be trapped inside; they'd still be able to exit through the turnstile.
- deleted 5y ago[deleted]
- deleted 5y ago[deleted]
- the_mitsuhiko 5y agoAt the same time the turnstiles in Paris are infuriating. I was stuck behind one of them with a stroller at the airport, nobody in sight to help me. I really prefer there not being any turnstiles to begin with.
- supernova87a 5y agoIn Paris it's not a problem / no difference is observed, because everyone just jumps over the turnstiles anyway and doesn't pay the fare.
- potatoz2 5y agoMuch more likely in NYC than Paris (among other things because in Paris there's a turnstile _and_ a door, typically, and NYC has swing open emergency exit doors people use routinely)
- londons_explore 5y agoFail 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.
- baud147258 5y agoin 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