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@deleted
How do ticket/oyster barriers at train stations detect that someone has walked through?
I always thought they worked on a timer - so you only had 5 seconds or so walk through after you've touched out.
But i noticed a strange behaving fellow yesterday tailgate through the barrier without touching out by covering a sensor of some type on the otherside of the gate.
Is this some kind of light sensor that detects when you've walked through?
If so ill walk through the barriers in my own sweet time from now on - will stop tailgaters also.