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It is inconvenient that passengers can’t know how many people in the carriages which they are waiting for. When the waiting line and corresponding carriage are both overload, we can imagine that the passengers who want to get off will collide with who want get on.
This design will solve this problem. The information of carrying capacity will show on the waiting line. People on the waiting line can follow the information to choose the waiting line which corresponding carriage is not full of passengers.
Yunlin University of Science and Technology