Yamate Tunnel

The Yamate Tunnel (Yamate Tonneru) carries the Central Circular Route (C2) of the Shuto Expressway in Tokyo, Japan, from the Takamatsu on-ramp in Toshima to near the Ōi Junction in Shinagawa. It has a length of 18.2 kilometers (11.3 mi). Lying 30 meters (98 ft) below the surface, about 70 percent of the tunnel was constructed by the tunnelling shield method. The roadway consists of two lanes in each direction. Nearly all of the tunnel lies beneath Yamate Street. On completion the Yamate Tunnel surpassed the Kan'etsu Tunnel on the Kan-Etsu Expressway, to become the longest road tunnel in Japan and the second longest road tunnel in the world. Most of the tunnel follows the route of Yamate Street (Tokyo Metropolitan Route 317).

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).