本刊讯近日,经过中国铁建十四局集团等单位建设者三年多的艰苦努力,目前世界海拔最高公路隧道—长拉山隧道顺利贯通。长拉山隧道全长2400米,位于青海省玉树州杂多县境内,海拔高达4500米,为青海省道309线多拉麻科至杂多段公路的关键控制性工程。S309多杂公路是玉树地震灾后恢复重建的重要工程,是青海省藏区干线公路网中通县二级公 Recently, after more than three years of painstaking efforts by the builders of China Railway Construction 14 Group and other units, the tunnel at the top of the world, Changlanshan Tunnel, which is the highest elevation highway in the world, runs smoothly. The Changlaishan Tunnel, a total length of 2,400 meters, is located in Zaduo County, Yushu Prefecture, Qinghai Province, with an elevation of 4,500 meters. It is the key control project of the Dolamac to Multi-section Highway of Route 309 in Qinghai Province. S309 Miscellaneous Road is Yushu earthquake reconstruction and reconstruction of an important project is Qinghai Province, Tibet Autonomous Region Road Network Zhongtong County two public