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Centralbron (Swedish: "The Central Bridge") is one of the major traffic routes in central Stockholm, Sweden, connecting the northern district Norrmalm to the southern Södermalm. It is 1,200 metres long and consists of two viaducts passing over Söderström ("Southern Stream") and Riddarfjärden close to Norrström ("Northern Stream") with an interjacent elevated section traversing Riddarholmskanalen and the adjacent eastern waterfront of Riddarholmen. Centralbron has a capacity for 130,000 cars per day. It is paralleled by the bridges (''Södra'' and ''Norra järnvägsbron'') and the tunnel of a two-track railway used by the commuter and freight trains. Centralbron does partly go on top of the Metro which opened on this stretch 1957 and planned together with the bridge. Over the years, Centralbron together with a suggested additional railway track have been much criticized and debated because of their unwieldy and rumbling presence in a delicate historical setting. Lately, the construction of a tunnel to replace them has been suggested. The cost of such a tunnel, several billion kronor, has put this on hold without any time set. A new metro tunnel has also been suggested because the metro goes below and parallel to Centralbron, making it a total of seven rail tracks and six road lanes crossing the water south of Gamla Stan on bridges. A new railway tunnel costing 15 billion kronor (Citybanan) is being built, but it is needed for capacity, and the existing railway will be kept. Nearby bridges include Riddarholmsbron, Vasabron, Strömsborgsbron, and Hebbes Bro. == Background == Since the first decade of the 20th century, numerous proposals labelled "Centralbron" had been produced and more than 20 of them scrapped before the elaboration of the general plan of 1928. During the 1930s the need for a "central bridge" crossing Gamla stan, the old city, declined due to the realization of the plans for a western traffic route, Västerbron, and the clover-shaped traffic junction at Slussen, both finally inaugurated in 1935.〔 〕 In 1930 plans for a Centralbron was therefore substituted by a temporary solution, by its customers dubbed ''Slingerbultsleden'' ("The Dodge Route"), criss-crossing the western streets of Gamla stan using two temporary bridges crossing Riddarholmskanalen to open out on Vasabron. While the metro system and Centralbron were being constructed Slingerbultsleden had to be scrapped, and in 1953 it was substituted by a 240 metres long pontoon bridge connecting the northern end of the now non-existent Riddarholmskajen ("Quay of Riddarholmen") to Klara strand. Its 7 metres wide roadway had a maximum capacity of 20,000 cars per day and remained in use until the completion of the northern bridge in 1967.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Centralbron」の詳細全文を読む スポンサード リンク
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