A vertical-lift bridge or lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck. The vertical lift offers several benefits over other movable bridges such as the bascule and swing-span bridge. Generally speaking they cost less to build for longer moveable spans. The counterweights in a vert...
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http://en.wikipedia.org/wiki/Vertical-lift_bridge
(from the article `movable bridge`) either a drawbridge, a vertical-lift bridge, a transporter bridge, or a swing (pivot) bridge. The drawbridge, or bascule, is the best known; it may ...
Found on
http://www.britannica.com/eb/a-z/v/17
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