
北陸新幹線の延伸ルート選定を巡り、国土交通省が示した費用対効果(B/C)の計算手法に疑義が呈されている問題で、金子恭之国交相は8日の会見で詳細な言及を避けた。特定のルートが優位になる前提条件が設定されていたとの指摘がある。
AI-generated summary
北陸新幹線の延伸ルートを巡り、自民党と日本維新の会が8つのルート案を比較検討してきた。国交省が示した費用対効果(B/C)に基づき、与党は7月に桂川案での検討合意に至った。
北陸新幹線の延伸ルートの議論で、国土交通省が与党に示した費用対効果(B/C)の計算手法が疑問視されていることについて、金子恭之国交相は8日の記者会見で「お答えを差し控える」と述べ、詳しい言及を避けた。
このB/Cを巡っては、特定のルートが優位になるような基準で計算していたことが分かり、複数の識者から「不適切だ」という指摘が出ていた。
延伸ルートを巡っては与党の自民党と日本維新の会が昨年12月から協議。自民党が推す「小浜・京都ルート」と維新が推す「米原ルート」など八つのルート案の比較をしていた。
B/Cは着工を判断する際の指標の一つ。国交省は6月、8ルート案のB/Cを与党に示した。このB/Cを踏まえ与党は7月、小浜・京都ルートのうち、JR桂川駅(京都市)付近を通る「桂川案」で検討を進めることで合意した。
だがB/Cの算出にあたっては、桂川案を含む小浜・京都ルートが、比較の上で優位になるような前提を置いていた。同ルート以外の7ルートは費用が膨らむ形になっており、複数の識者が問題があると指摘している。
記者会見で、この問題についての見解を問われた金子氏は、桂川案は「正式なプロセスを通じて決めて頂いたもの」だとして、「その他のことについてお答えすることは差し控えたい」と回答。さらに与党が検討を続けてきたことについて、「B/Cも含めいろいろなことを勘案し、長きにわたって検討して頂いたことを受け止めていきたい」とし、計算方法などについては言及しなかった。

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