清澄山道ループ橋, Spiral bridge in Kamogawa, Japan
The Kiyosumi Mountain Road Loop Bridge is a spiral bridge in Kamogawa that winds gently upward over mountainous terrain without steep grades. It allows both vehicles and pedestrians to pass through hilly landscape where the natural slope would otherwise make direct travel difficult.
The bridge was completed in 1969 as part of infrastructure development to improve transportation connections in the Chiba region. Its spiral design represented an innovative solution to enable safe passage over difficult terrain.
The bridge name originates from the Gakusui-kai Alumni Association of Tokyo University of Marine Science, reflecting local educational connections.
The bridge is accessible to both pedestrians and vehicles and offers safe passage in various weather conditions thanks to its solid structure. Visitors should note that the spiral route takes longer than a direct path, so plan extra time to cross it.
The unusual spiral shape allows the bridge to overcome elevation changes gradually without becoming steep. This makes crossing easier than a direct path would be, and the construction is an example of practical engineering adapted to the landscape.
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