Guthrie rolling bridge, a type of retractable bridge, also known as a thrust bridge
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Access to the fort was down a curving ramp cut into the glacis, then through a gatehouse set deep in the scarp of the ditch, reached by a rolling bridge that withdrew into the gatehouse.
The Rolling Bridge was conceived by British designer Thomas Heatherwick, designed by SKM Anthony Hunt with Packman Lucas, and built by Littlehampton Welding Ltd.