南坳隧道是国道307、207线阳泉市绕城改线工程全线最长隧道及重难点控制性工程，全长1.5公里，为双线两车道分离式隧道。隧道下伏煤矿采空区且埋深浅，施工难度较大。
据悉，国道307、207线阳泉市绕城改线工程是山西省“十三五”公路网规划建设重点项目、2020年山西省级重点工程项目，也是阳泉市拉大城市框架、改善人居环境的重大举措。
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