A moveable bridge is a bridge that moves to allow passage for (usually) boats or barges. By making the bridge movable it may be made low, which avoids the expense of high piers and long approaches, greatly reducing the cost of the bridge. The principle disadvantage is that the traffic on the bridge must be halted when it is opened for passages. For seldom used railroad bridges over busy channels the bridge may be left open and then closed for train passages. For small bridges bridge movement may be enabled without the need for an engine. Some bridges are operated by the users, especially those with a boat, others by a bridgeman, sometimes remotely using video-cameras and loudspeakers. Generally the bridges are powered by electric motors, whether operating winches, gearing, or hydraulic pistons.

There are often traffic lights for the road and water traffic, and moving barriers for the road traffic.

Types of moving bridges

• Bascule bridge
• Curling bridge
• Drawbridge
• Folding bridge

• Jetway
• Lift bridge
• Retractable bridge (Thrust bridge)

• Submersible bridge
• Swing bridge
• Tilt bridge
• Transporter bridge

See also

• Bailey bridge and Medium Girder Bridge - transportable or relocatable bridges.
• Pontoon bridge - may be built with a barge or boat-like section that may be moved for passage.

Bridges

bewegliche Brücke | Brug_(bouwwerk)#Bruggen_naar_wijze_van_openen_of_dichtgaan | Most ruchomy