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日本全国の円形歩道橋とのの字な歩道の一覧
https://rasandroad.com/spiral/about_circular-footbridge
https://rasandroad.com/spiral/category/circular-footbridge
世界の円形歩道橋・螺旋階段歩道橋はこちら→ https://www.google.com/maps/d/edit?mid=1UvozEZPFVuLtLzLYW510H3IC7xg&usp=shar…