You can trample on the outskirts of the subway. Subway is an independent rail transit system, which is not affected by the ground road conditions, and can operate normally according to the designed capacity, and transport passengers quickly, safely and comfortably. There are special inspectors to check potential safety hazards at any time, so the periphery is also safe and can be trampled. When waiting for the subway train, you must stand behind the yellow safety line, and don't look around when the train enters the station.