Rolling Bridge

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A bridge is assembled from eight parts. Each part has a platform and a trapezium railing. The top of the adjacent railings are connected with two arms that are hinged to an extendable vertical bar. When the bars are extended the bridge curls up into an octahedral shape.
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Contributed by: Sándor Kabai (April 2008)
Open content licensed under CC BY-NC-SA
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For more information on this bridge, see the Wikipedia entry.
Permanent Citation
"Rolling Bridge"
http://demonstrations.wolfram.com/RollingBridge/
Wolfram Demonstrations Project
Published: April 25 2008