西藏S5线拉泽隧道

西藏S5线（拉萨至泽当快速路）项目由中交二公局采用EPC模式承建，其中圭嘎拉隧道设计为分离式双洞隧道，左洞全长12878米；右洞全长12945米，平均海拔约4300米，是目前世界最长的超高海拔公路隧道，且存在煤层瓦斯、突泥涌水等复杂地质。

The project of Tibet Line S5 (Lhasa-Tsedang Expressway) was constructed by CCCC Second Highway Engineering Co., Ltd., in which the Guigala Tunnel was designed as a separate double-hole tunnel with a total length of 12,878m. The length of the right tunnel is 12,945m, with an average altitude of about 4,300m. It is the longest highway tunnel with super high altitude in the world at present, besides, it has complicated geology with coalbed meth ane and water and mud gushing.