Yurakucho Line extension actually benefits “Tokyo Metro” and “Tokyo Metropolitan Government” as well! It is not only Koto-ku that will benefit from the extension of the Yurakucho Line between Toyosu Station and Sumiyoshi Station. For Tokyo Metro, the flow of north-south movement from Toyocho Station will reduce the congestion in the busiest section (between Kiba Station and Monzennakacho Station on the Tozai Line, roughly “Toyocho to Monzennakacho Station”). The advantage for Tokyo Metro is that it would reduce congestion on the busiest section (Toyocho Station to Monzennaka-cho Station on the Tozai Line, roughly “from Toyocho to downtown Tokyo”) by about 20%. It would also give users a choice of alternative routes in the event that nearby railroads are suspended due to a disaster or personal accident. The Yurakucho Line extension is a “north-south axis of the district,” a “catalyst for redevelopment and disaster prevention,” and an “alleviator of congestion on existing lines. The extended section of the Yurakucho Line is expected to be used by 300,000 passengers per day, so the benefits are certainly significant. That is why the “cost-benefit ratio (B/C; a B/C of 1 or higher is considered “effective”), which measures the cost effectiveness of construction, including social benefits, is estimated to be 3.03 over 30 years, or 2.6 even if the economic recession causes people to move away from the city center. In other words, it is considered to be “twice or three times as effective as the cost of construction. Cost-benefit ratio: economic and other benefits/construction costs; a ratio of 1 or more is considered “construction is effective. Figures are from the Ministry of Land, Infrastructure, Transport and Tourism’s “Survey on Railway Networks that Contribute to Strengthening International Competitiveness in the Tokyo Area,” 2019.
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