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This vacancy display light can help passengers quickly find a seat. The train ticket holders enters the car ,the vacancy display light is turned off,Do not wait until all the people sitting,before they can sitting on the seat.
Jiangxi University of Finance and Economics
Nanchang, China
Qizhen huang,
Jiangxi University of Finance and Economics
Tian Wu ,
Jiangxi University of Finance and Economics
Rifeng Mao,
Jiangxi University of Finance and Economics
Xin Yan,
Jiangxi University of Finance and Economics