Central Circular Route

The Central Circular Route has a total length of 48.8 kilometers (30.3 mi).

It is a ring that lies approximately 8 km (5.0 mi) from the center of the city and goes through the wards of Edogawa, Katsushika, Adachi, Kita, Itabashi, Toshima, Shinjuku, Nakano, Shibuya, Meguro, and Shinagawa.

Yamate Tunnel

The eastern half is an elevated structure and the western half is an underground one. The Yamate Tunnel is a deep tunnel constructed beneath Yamate Street, the first section over 11 km (6.8 mi) in length, was opened to traffic on 22 December 2007. From 2010, the tunnel extended the Central Circular Route south from near Ikebukuro to Ohashi Junction connecting with Route 3. The last 9.4 kilometers (5.8 mi) through Meguro and Shinagawa was opened to traffic on 7 March 2015.[1] When this last section of the tunnel opened the Yamate Tunnel formed Japan's longest, and the world's second longest road tunnel.[2] During the tunnel's first week of operations, traffic volume on the Inner Circular Route was reduced by seven percent from the previous week, and congestion on expressways inside the Central Circular Route (an index measured by recording segments where average traffic speed is less than 40 km/h (24.9 mph), and multiplying the affected distance by the affected time) was approximately halved from the previous week.[3]

The C2 begins and ends at the Bayshore Route, which serves to close the southeastern part of the loop.

The first section of the Central Circular Route was opened to traffic on 30 March 1982. Since then, the expressway was completed in phases. Construction work on underground sections of the route began in 1992. Given the extensive tunneling and engineering challenges involved, construction costs for the route were estimated to be 2 trillion yen.[4] The Central Circular Route was completed on 7 March 2015.[5]

List of currently existing interchanges and exits ordered following the outer loop (clockwise):