Improvement of the Minami-Tama Ridge Main Line

The Minami-Tama Ridge Main Line is an urban planning road approximately 16.6 kilometers long, connecting from the Tamagawa Bridge in Chofu City, through Inagi City, Tama City, and Hachioji City, to Machida Street in Machida City.

October 27, 2021, about the Minami-Tama Ridge Line project (from Momura, Inagi City to 5-chome, Seigaoka, Tama City) (Tokyo Metropolitan Government construction)

Regarding the Tama Urban Planning Road No. 3-1-6 Minami-Tama Ridge Line (from Momura, Inagi City to Seigaoka 5-chome, Tama City), the Tokyo Metropolitan Government has obtained urban planning road project approval from the Ministry of Land, Infrastructure, Transport and Tourism and announced it on July 30, 2021.
In Tokyo, regarding the explanation of the project overview, to prevent the further spread of COVID-19, instead of holding briefing sessions, we will conduct a written briefing using the explanatory materials at the link below (distributed on October 27, 2021).

• (Tokyo Metropolitan Bureau of Construction Website) Overview of Road Improvement Projects Explanation Materials (October 27, 2021) (External Link)
• (Tokyo Metropolitan Government Press Release) Project Start (July 30, 2021)(External Link)
• (Tokyo Metropolitan Bureau of Environment Website) Special Environmental Consideration Document / Environmental Impact Assessment Document (February 2021) (External Link)

February 2015: Formulation of the Maintenance Policy for the Minami-Tama Ridge Main Line

The Minami-Tama Ridge Main Line was designated as an urban planning project in 1969 in conjunction with the development of Tama New Town. Although some sections have been developed as four lanes, most of the road remains a provisional two lanes, causing chronic traffic congestion and leading to traffic spilling into residential streets, which has deteriorated the roadside environment.
Tokyo Metropolis, considering its role as a wide-area trunk road network, has been reviewing the development form of the provisional two-lane sections and other aspects, and in February 2015, established a development policy to make the entire route four lanes and to convert the cut-and-cover structure sections to at-grade structures.

Basic Concept

• To alleviate traffic congestion and ensure the functionality of the regional trunk roads, all sections will be expanded to four lanes.
• Due to access to the roadside and the integration with Community Development, it will be a flat structure.
• Make effective use of the current road land and create a road form that considers the surrounding environment.
• The area near the city border of Inagi City and Tama City will have a tunnel structure, and a route that considers the conservation area will be examined.
  (A conservation area is a region designated based on the ordinance concerning the protection and restoration of nature in Tokyo)

• Description Slide (PDF 5.6MB)