7月27日，G213线祁连县城至大通河桥段改建工程大冬树山隧道顺利贯通。
G213线祁大公路控制性工程大冬树山隧道于2018年5月28日开工建设，隧道全长2485米，为一座双向两车道二级公路隧道，进出口海拔为3868米至3920米。
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