[Gllug] Oyster cards vulnerable?

[F Andersen]

Chris Bell wrote:
>    I think it depends on the gate. Some appear to be set to catch two people
> running through very close together, others allow large hand baggage through
> without problems. If the next person follows too close behind, they may need
> to back out and try again.
> 
> 

I get the feeling there's some kind of motion sensor just behind the 
gate. If you stand close to the gate while swiping your card, the gate 
won't open. When my oyster doesn't let me through, I've often been told 
by tube workers to step away back from the gates and try again, and this 
fixes it.

Perhaps this is to stop two people going through as the first person 
would stand close to the gates.
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