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A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
Text relevant to the diagram should be added to its right by continuing it immediately after the last closing brace of the template. Text for a new subject or topic should be started below the diagram by inserting the template {} after the last closing brace and then continuing with text. 2.
Infobox templates listed here should also be included in the category buildings and structures infobox templates. Templates that concern a bridge or bridges in an individual country can also be included in a subcategory of buildings and structures templates by country, such as United Kingdom buildings and structures templates.
To change this template's initial visibility, the |state= parameter may be used: {{Swing bridges in Yorkshire | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Swing bridges in Yorkshire | state = expanded}} will show the template expanded, i.e. fully visible.
The bridge may be stiffened by the addition of cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. An example is the 220-meter-long (720 ft) bridge across the river Drac at Lac de Monteynard-Avignonet: this bridge has stabilizing cables below and to the side of the deck.
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A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.