Moveable bridge

A movable bridge is a type of bridge that can move, or open and close, which can be very useful. To open and close the bridge, it's built on a track and has special motors that move it. These motors can be powered by electricity, or by a person with a crank. When the bridge is opened, it creates a gap in the track, so that boats and other large vehicles can go through. When the bridge is closed, it creates a path for cars and people to cross. With movable bridges, it's easier for boats to go through and for people to travel between two different places.