Swing Barrier, generally called flapping gate in the rail transit industry, its blocking body (gate pendulum) is in the form of a plane with a certain area, perpendicular to the ground, and blocking and releasing are realized by rotating and swinging. The material of the arresting body is usually stainless steel, plexiglass, tempered glass, and some also use special flexible materials outsourced with metal plates (to reduce the injury of pedestrians). Bridge Smart Swing Barrier It is a more popular name inherited from the initial shape of the bridge structure. It is composed of a main box and two movable swing rods. The swing rods can swing 180° or 90° to achieve the purpose of dissuading or letting go.