How does it work? how does the door of bus close?

Question

how does the door of bus close?

Answer 1

Once you get in, the driver activates the hydraulic system of the door. As simple as that.Once in, You don't have to close it manually.

Answer 2

well th bus driver pulls a handle which is connected to the door.

Answer 3

air pressure actuator, or hydraulic actuator and a switch...