Design
Pegasus Bridge and the structure that replaced it in 1994 are examples of a distinct subtype of bascule bridge, the "Scherzer rolling lift bascule bridge" or "rolling bridge". Bridges of this type do not pivot about a hinge point, but roll back on curved tread plates attached to the girders of the main span. This design allows a greater clearance of the waterway for a given opening angle.
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