How does the queuing machine have people queue orderly?

In modern society, there is someone likes to jump a queue when queue. Do you know how does the self-service terminal have people queue orderly?

People would get a sequence number from the machine, and the self-service terminal will call their number in turn. They will be filter if they jump a queue. So that people would like to be in queue. And it is really convenient. The hosital workers is more effective with the queue management system. Which reduces the conflict. Hope people will be more ordered even if without the queue management system, keep a good habit that initiative queue 😉

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