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The Triangle Link ((ノルウェー語:Trekantsambandet)) is a fixed link with three branches that connects the islands of Stord and Bømlo to each other and to the mainland at Sveio, Norway. It consists of the underwater Bømlafjord Tunnel from Sveio to the island of Føyno, the Stord Bridge from there to Stord, and a road including the Bømla Bridge and the Spissøy Bridge to Bømlo. The section from Sveio to Stord is part of European Route E39, while the branch to Bømlo is part of County Road 542. The Bømlo Tunnel is long and reaches below mean sea level. It is the longest subsea tunnel in Norway and was the deepest in the world when it opened. The Stord Bridge and Bømla Bridge are both suspension bridges, with lengths of and main spans of . The Spissøy Bridge is a beam bridge. The link is long toll road with a toll plaza on Føyno. The section from Stord to Bømlo has a pedestrian and bicycle path. Plans for a link between Bømlo and Stord were first launched as a pontoon bridge in the 1960s. In the late 1980s, the plans evolved into a triangular project. There was controversy surrounding the project, in particular from environmentalists. The Parliament of Norway passed the plans in 1996, and construction started the following year. The bridges and link between Stord and Bømlo opened on 28 December 2000, while the tunnel opened on 30 April 2001. The link cost 1.8 billion Norwegian krone (NOK) after substantial cost overruns and will remain a toll road until 30 April 2013. ==Route description== The Triangle Link is part of two routes, European Route E39 and County Road 542. The section from Stord to Sveio, including the Stord Bridge and the Bømlafjord Tunnel, is part of E39—the Coastal Highway—which runs along the west coast of Norway. The section from the interchange on Føyno, including the Bøla Bridge and the Spissøy Bridge, is on County Road 542. The link acts both as a mainland connection for Stord and Bømlo to the mainland at Sveio, as well as a link between the two island communities, which have a combined population of 30,000.〔Hauge: 7〕 The Bømlafjord Tunnel is a long subsea tunnel which crosses Bømlafjorden. It is wide, tall and reaches below mean sea level. The tunnel has three lanes, one downhill and two uphill, with the direction of the extra lane switching at the bottom.〔Hauge: 109〕 When it opened, it was the longest and second-deepest subsea tunnel in Europe.〔 Stord Bridge is a suspension bridge which crosses Digernessundet, connecting Stord with Føyno. It is long and has a main span (distance between the pylons, or towers) of . The bridge is wide and has a clearance of . It has two tall pylons, one foundationed on Digernesklubben and one on Føyno.〔Hauge: 104〕 The pylons were built in concrete, while the deck is built as 19 in steel sections, each long and weighing .〔 Stord Bridge has the second-longest span in Norway, after the Askøy Bridge.〔 Bømla Bridge is a suspension bridge which crosses Spissøysundet, connecting Spissøy and Nautøya. It is long and has a main span of . The bridge is wide and has a clearance of . The higher clearance was built to allow ship traffic which runs through Nyleia between Bømlo and Stord to continue to run. The bridge has two tall pylons, one foundationed on Brunsholmen and one on Spissøy. The bridge has a similar aesthetically design to the Stord Bridge, and also features a steel deck with concrete pylons.〔Hauge: 106〕 It has the fifth-longest span in Norway.〔 Spissøy Bridge is a beam bridge which crosses Gassasundet, connecting Bømlo with Spissøy. It is long, consists of five spans and has a clearance of .〔 The fixed link project also includes of highway. On Stord, E39 received a new two-lane, limited-access road from Meatjørn to the bridge. This included a new grade separated (two-level) interchange in the southern part of Leirvik and a culvert—the Digernes Tunnel—immediately before the bridge. In Sveio, the link included of new limited-access road from the tunnel to a grade-separated interchange at Dalshovda. In Bømlo, there was a new road built across the islands of Spissøy and Nautøy—including an intersection on Spissøy. It further consisted of a new section of road from the Bømlo side of Spissøy Bridge at Gassasundet to Røyksund, and from Gassasundet to Grøvle, including a new tunnel through Stokkajuvet. A combined pedestrian and bicycle path runs along the whole section between Stord and Bømlo, with a grass division on the land parts between the road and the path. Underpasses and walls were built with natural stone.〔Hauge: 102〕 The tolls are collected at a toll plaza located on Føyno. The plaza is constructed as a grade-separated intersection, so that any car passes through the plaza once. However, traffic only traveling between Føyno to Bømlo does not have to pay. Cars driving along E39 drive straight ahead through the plaza, while cars to or from Bømlo need to use the interchange. There is also an intersection allowing access to the island. The plaza has six lanes, of which two in each direction have a toll booth and one in each direction has an automatic collection. The toll station uses the Autopass toll collection, which allows passage without stopping, in addition to manual collection.〔Hauge: 110〕 Passengers, pedestrians, bicycles, motorcyclists and mopeds are free.〔Hauge: 111〕 As of 2011, the fees are NOK 85 for cars and NOK 270 for trucks. Frequent travelers can prepay for at least 40 passings to the toll company, and receive a 40 percent discount.〔 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「Triangle Link」の詳細全文を読む スポンサード リンク
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