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Grade-Separated Intersections

Roads and Railways

In Tokyo, there are approximately 1,070 rail crossings at present. Rail crossings impede the flow of traffic and are barriers to safely and efficiently conducting urban activities. The Tokyo Metropolitan Government is moving ahead with grade separation projects in order to eliminate traffic congestion at rail crossings and enhance urban functionality and convenience.

Projects to eliminate multiple crossings

As a part of road improvements, these projects elevate sections of railway or move them underground, eliminating a number of crossings all at once. Projects significantly contribute to the development of the surrounding area, alleviating traffic congestion at railway crossings, reunifying communities divided by railway tracks, and facilitating the use of the space below the elevated tracks.

Railway crossings have been eliminated at 384 locations in Tokyo to date. At the current time, projects are underway at ten locations on seven rail lines, including the Seibu Shinjuku Line and Keisei Oshiage Line.

In fiscal 2013, along with starting projects in three locations on two rail lines, including the Keio Line (Sasazuka Station-Sengawa Station), projects to eliminate rail crossings in seven locations on the JR Nambu Line (Inadazutsumi Station-Fuchuhonmachi Station) were completed.

The Bureau will continue to advance projects already underway in order to achieve grade separation, as well as work to obtain approval for new projects.

  • Prior to elevation
  • Following elevation

Keikyu Main Line-Airport Line continuous grade separation project (near Keikyu Kamata Station)

Projects to eliminate individual crossings

These projects involve elevating an individual road or relatively small sections of a railway to achieve grade separation.

In April 2013, the Nishitokyo Higashi-fushimi Tunnel was completed where Nishitokyo Route No. 3-2-6 (Chofu Hoya Route) and the Seibu Shinjuku Line intersect, facilitating the smoother flow of traffic. Currently, projects are underway at fourteen locations, including on Auxiliary Route No. 74 (Takadanobaba) and Nishitokyo Route No. 3-2-6 (Nishitokyo).

Grade separation of roads

At intersections with a high volume of traffic, traffic congestion and problems generated by congested traffic, including increased exhaust emissions, are occurring. As such, the Bureau is advancing with grade separation projects that elevate one of the roads or move one of the roads underground.

By elevating the high-traffic-volume Kurmaebashi-dori Road to create the Shinkoiwa Overpass, the Bureau aimed to alleviate traffic congestion and improve the environment along the road.

koiwa Overpass (Arial view of the Tatsumibashi intersection)
Road and Railway Grade Separation Projects

Road and Railway Grade Separation Projects [414KB]PDF(Open link in a new browser window)

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