Leonardo da Vinci designed a swing bridge that could rotate aside to let boats pass and could be deployed for military use.
His bridge concept used a pivoting span supported by a central structure. When opened, the bridge would clear the waterway; when closed, it would provide a crossing for troops or travelers. The design shows Leonardo’s interest in combining mobility, structural stability, and rapid construction.
Leonardo proposed the bridge in the context of military engineering, where armies needed temporary crossings and defensive advantages. A swing bridge is different from a drawbridge: a drawbridge rises or tilts, while a swing bridge rotates horizontally around a vertical pivot. The terms are sometimes mixed in popular descriptions of Leonardo’s work.
The famous single-span bridge he proposed for Sultan Bayezid II is a separate design and is generally described as an arched bridge. Leonardo’s movable bridge studies demonstrate that his engineering notebooks covered both permanent infrastructure and adaptable military equipment.