Moving Bridges

Moving Bridges

Drawbridges were the first moving bridges. They were built to help defend castles. The bridges could be raised to keep attackers away.

Today, bridges over rivers move to let ships pass by safely. There are many different types of bridges that move.

Some bridges tilt up to open on one side. Some bridges have two pieces tilt up to open in the middle.

Some bridges fold up like an accordion.

Some bridges have a middle part that turns to make space on either side.