Comment Re:Heard a dude talk about it... (Score 1) 271
The scanners emit a loud beep and display the remaining balance whenever they debit the money. Of course machines and operates can and did go wrong but if you've been keeping track of the money still on your card you'll notice when that happens.
Also, the entrances/exits are one-wayed, so the scanners will refuse to operate on the same card twice; on say buses where there are no exit-scanners there is a hold-time after a specific card has been scanned, during which no scanner will operate on it.
Also, the entrances/exits are one-wayed, so the scanners will refuse to operate on the same card twice; on say buses where there are no exit-scanners there is a hold-time after a specific card has been scanned, during which no scanner will operate on it.
