High Quality Content by WIKIPEDIA articles! The Yamate Tunnel carries the Central Circular Route (C2) of the Shuto Expressway from the Takamatsu on-ramp in Toshima to the hashi Junction in Meguro, Tokyo, Japan. THe overall length is 11 km. THe segment linking the Takamatsu on-ramp and Nishi Shinjuku Junction in Shinjuku opened to traffic on December 22, 2007. ON the same date, an above-ground segment linking the tunnel to the Kumanoch Interchange in Itabashi and Toshima also opened. LYing 30 m below the surface, about 70% was constructed by the tunnelling shield method. THe roadway consists of two lanes in each direction. ANother, as yet unnamed, tunnel is under construction as of December 12, 2007. IT connects underground with the Yamate Tunnel, extending it to the i Junction in Shinagawa. NEarly all of the tunnel lies beneath Yamate Street. WHen complete, the Yamate Tunnel, together with this extension, will surpass the Kan'etsu Tunnel on the Kan-Etsu Expressway, becoming the longest roadway tunnel in Japan. ACcording to the schedule, in 2009, the Nishi Shinjuku hashi segment will be complete, and in 2013, everything from hashi to i will be open.