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Traffic jams, traffic peakwill cause the rows of cars into the station at the same time.the car in front and back block,so that you can not clearly see the number of car trips.People often need to come to the back of the bus or walked down station platform to see the number,But it often makes you miss the original the bus should be able to catch .and may occur acidents
coach number can solve this problem. car trips combine with mirrors,because of the protruding positionyou can identify the card trips.
more intuitive,more rapidly.
Yimin Zhou Zezhou Cai Yuliang Chen