|The mechanism by which a movable bridge moves to clear the way below.|
|Used on these elements|
|Documented values: 8|
|Tools for this tag|
Use bridge:movable=* to describe how a particular movable bridge (indicated by bridge=movable on the road, and/or man_made=bridge on the outline of the bridge) moves to clear the way below. Note that this key may be used without tagging bridge=movable, to indicate a formerly movable bridge that has been fixed shut.
Almost all movable bridges have one, or perhaps two, movable spans which are flanked by fixed spans. The way for the bridge should be divided at the ends of the movable span(s) and only the movable spans should be tagged with bridge=movable and bridge:movable=*. If desired, the piers on which the movable span rests (usually indicated by the nodes where the ways for the fixed and movable spans join) can be tagged with bridge:support=*. The pier on which certain movable spans pivot (swing bridges pivot horizontally, bascule and drawbridges vertically) can be tagged as bridge:support=pivot_pier and the support towers for the two ends of a lift bridge as bridge:support=lift_pier.
Movable bridges on highways typically have traffic barriers which should be tagged as well, e.g., barrier=lift_gate. access:conditional=* and maxheight:conditional=* can be used to tag the bridge's way and the waterway beneath, respectively, if a regular scheme exists for opening and closing the bridge.
|bridge:movable||bascule||A type of movable bridge, a bascule bridge contains one or two spans, one end of which is free and swings upwards. A counterweight at the pivoting end of the span or spans balances the weight as the free end rises. Although sometimes called a "drawbridge", that term is applied more strictly in this tagging scheme (see below).|
|bridge:movable||drawbridge||A type of movable bridge similar to the bascule, as one end of the bridge is free and swings upwards. However, this type of bridge is raised by chains attached at the free end.|
|bridge:movable||lift||A type of movable bridge, a lift bridge contains a span which rises vertically while remaining parallel to its closed position. The span is suspended between lift towers at each end when open.|
|bridge:movable||submersible||A submersible bridge is a type of movable bridge that lowers the bridge deck below the water level to permit waterborne traffic to use the waterway.|
|bridge:movable||swing||A type of movable bridge, a swing bridge contains a span supported by a pivot resting on a pier, either at the center or towards one end of the span. Rotating the span on the pivot opens or closes the bridge.|
|bridge:movable||transporter||A bridge where a segment of roadway or footway is suspended from cables and carried back and forth like a gondola.|
|bridge:movable||retractable||A bridge where a segment of roadway can be rolled or slid backwards to open a gap.|
|bridge:movable||tilt||A tilt bridge is a type of moveable bridge which rotates about fixed endpoints.|
This table is a wiki template with a default description in English. Editable here.