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When someone unfamiliar with the subway system happens to take the subway during peak times, checking the stops would be hard, for the simple reason that it is always blocked from view by the crowds. Therefore the passenger is hard to know when and where to get off from the numerous stops on an alien subway line. We utilize the upper space of the roof of the car to be the indication board for orientation. No matter where you are, either sitting on the seats or standing at the sides of the car, you can get the information of the stops at ease. This saves a lot of time and provides greatly convenience to the travelers.