However, the blank space along the elevated Saikyo line is a buffer zone called 'environmental space,' which has been provided taking into account noise-related problems, and is not land acquired for extending the Shinkansen line.
ただし、埼京線高架沿いの空き地は「環境空間」と呼ばれる騒音問題を考慮して設けられた緩衝地帯であり、延伸のために確保された用地ではない。