15-832: The Yamate Tunnel ( 山手トンネル , 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
30-637: A separate emergency path are located no more than 350 meters (1,150 ft) apart. Stairways lead up to Yamate Street. A duct running parallel to the roadway supplies fresh air and removes exhaust. Dust-collection systems are designed to remove 80 percent of particulates from the air. The Ohashi Junction in Meguro , connecting the tunnel to the Shibuya Route , required construction of stacked elliptical ramps 400 meters (1,300 ft) in circumference and 175 meters (574 ft) in diameter, similar in size to
45-403: 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 . The eastern half is an elevated structure and the western half is an underground one. The Yamate Tunnel
60-499: 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. When this last section of
75-698: Is one of the routes of the Shuto Expressway system serving the central part of the Greater Tokyo Area . The route is a circumferential highway running through the outer wards of Tokyo. The route is the middle of four ring expressways planned for the city; the other three being the C1 Inner Circular Route , the C3 Tokyo Gaikan Expressway , and the C4 Ken-Ō Expressway . The Central Circular Route has
90-555: Is one of the routes of the Shuto Expressway system serving the central part of the Greater Tokyo Area . The route is a complete loop around the central Tokyo wards of Chiyoda , Chūō , and Minato , with a total length of 14.8 kilometers (9.2 mi). In addition to serving areas of central Tokyo, the Inner Circular Route also serves as the origin of the radial routes of the Shuto Expressway. A section of
105-548: The Meguro River between Shibuya and Oimachi. The elevated expressway plan was shelved shortly after, following concerns about environmental issues and local resident protests, but re-emerged in the 1990s in the form of a tunnel plan. The final plan for the southern portion of the tunnel, approved in 2004, followed Yamate Street and the Meguro River, in order to minimize tunneling under private property. Construction on
120-587: The National Stadium track. For soundproofing reasons, the junction was encased in over 120,000 cubic meters (160,000 cu yd) of concrete. The structure was used as the centerpiece of an urban planning project that includes the Meguro Sky Garden park and several high-rise condominium towers. C26 The Yamate Tunnel passes above the Yūrakuchō and Ōedo subway lines. It crosses below
135-702: The Tōzai and Marunouchi subway lines, as well as the Keiō and Keiō New Lines and the Tōkyū Den-en-toshi Line . The tunnel runs parallel to the Ōedo Line, along a segment between Nakai and Nishi Shinjuku Gochome Stations . Nakai and Nakano Sakaue Stations , lying beneath the Yamate Tunnel, have escalators that pass between Yamate's two tunnels. Central Circular Route The Central Circular Route ( 中央環状線 , Chūō Kanjō-sen ) , signed as Route C2 ,
150-862: The Yamate Tunnel began in 1992. The Takamatsu–Nishi Shinjuku segment opened on 22 December 2007. On the same date, an above-ground segment linking the tunnel to the Kumanochō Interchange in Itabashi and Toshima opened. The 9.4-kilometer (5.8 mi) section between Nishi Shinjuku and Ohashi opened on 28 March 2010. The last section linking Ohashi to the Bayshore Route opened on 7 March 2015. The tunnel has many operational and safety facilities. Among them are emergency telephones and cameras at 100-meter (330 ft) intervals. Fire-safety equipment includes infrared sensors, fire extinguishers, foam sprayers, and pushbutton alarms. Emergency exits leading to
165-418: The affected distance by the affected time) was approximately halved from the previous week. 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
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#1732780388085180-595: The expressway is built above the Shibuya River . The expressway was built between 1962 and 1967, partly in preparation for the 1964 Summer Olympics . In 2009, Tokyo private industries proposed funding a project to dismantle the elevated expressway and put them underground. In May 2020, the Shuto Expressway Company received approval for plans to relocate 1.8 kilometers of the expressway underground between Kandabashi and Edobashi Junctions, in
195-567: The extensive tunneling and engineering challenges involved, construction costs for the route were estimated to be 2 trillion yen. The Central Circular Route was completed on 7 March 2015. List of currently existing interchanges and exits ordered following the outer loop (clockwise): Route C2 Outer Loop to Route 5 inbound is not connected. Route C2 to Route 7 inbound is not connected. Inner Circular Route The Inner Circular Route ( 都心環状線 , Toshin Kanjō-sen ) , signed as Route C1 ,
210-606: 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). Plans for an expressway on the route were first drawn up around 1970, initially in the form of an elevated expressway over
225-511: The tunnel opened the Yamate Tunnel formed Japan's longest, and the world's second longest road tunnel. 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
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