The Triangle Link () 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 remained 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 the E39 highway (the Coastal Highway) which runs along the west coast of Norway. The section from the interchange on the island of 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. 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