Wow, there are 275 cities in China that have metro systems. Here in the US there must be about 6 cities with metro rail systems. We are FAR behind the rest of the developed world.
But why bother with these gates? A better system would use RFID and near-field so cheaters would be automatically detected and there would be a transit cop waiting for them when they get off the train. The toll lanes already work this way in California. You never stop to pay, they just deduct the toll from you account automatically but if you have no account setup they send you a bill in the mail. The first bill is just the toll with no added fee and a letter explaining how to set up automated payment.
Ideally, we'd use this even for groceries. Just take what you want and walk out of the store.
But why bother with these gates? A better system would use RFID and near-field so cheaters would be automatically detected and there would be a transit cop waiting for them when they get off the train. The toll lanes already work this way in California. You never stop to pay, they just deduct the toll from you account automatically but if you have no account setup they send you a bill in the mail. The first bill is just the toll with no added fee and a letter explaining how to set up automated payment.
Ideally, we'd use this even for groceries. Just take what you want and walk out of the store.