1. The city subway shuttles through the ground to ease the traffic on the city ground. The speed of the subway is very fast, so the subway stations are equipped with protective barriers.
2. The safety fences of subway stations are designed according to the safety regulations. When people are waiting, they should wait outside the safety line one meter away from the safety fence.
3. When the subway vehicle stops, the safety door of the subway station and the safety door of the subway vehicle will be opened automatically after they coincide.
4. When people take the subway, they can't stand near the vehicle door. They need to take the subway safely and set up seats. They can only get off when the subway stops stably.
5. When people get off, they should be ready to take their belongings and get off quickly. They can't stay near the subway vehicles.
6. When people take the subway, they need to wait in line outside the safety line for getting on. When they get off, they also need to wait for the vehicles to stop stably and get off in order.