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Sweden's biggest road and tunnel project

A 21 km motorway bypass is being constructed to relieve traffic in Stockholm: E4 Bypass Stockholm, or in Swedish "E4 Förbifart Stockholm". The bypass, scheduled for completion by 2030 doesn't just stand out as one of Sweden's biggest infrastructure projects: its 18 kilometres of tunnel will make it the second-longest underground tunnel in city buildings. Doka is providing the formwork equipment for four project sections. Stockholm is growing astonishingly fast – in fact, the Swedish capital has the fastest growth rate in Europe. The 14 islands that make up the Stockholm region are currently home to over a fifth of the Swedish population, with 2.1 million inhabitants.

By 2030, this is expected to grow to around 2.5 million. For the region to continue to develop, well-functioning infrastructure is essential, and major investments are being made in Stockholm. For example, local public transport has been improved by a new railway through Stockholm's central districts, the Citybanan, which was officially opened in 2017. Although the Citybanan represents an important step towards improving public transport systems, it is not sufficient to combat the increasing car traffic in the city.

Stockholm currently only has one major road artery, Essingeleden. The road was opened in 1967 and is designed for 80,000 vehicles per day. Fifty years later, it is travelled by around 160,000 vehicles on a typical working day – and rising. Consequently, the transport system in Stockholm is extremely vulnerable, with Essingeleden in particular very sensitive to road accidents. To address this situation, a 21 km motorway is being constructed that will link the south of the city (Skärholmen) with the north (Häggvik). The new road, "E4 Bypass Stockholm", will divert traffic away from the city centre to the west.

One of the longest road tunnels in the world

Most of the bypass – 18 of the 21 kilometres – will run through tunnels, making the bypass the world's second-longest urban road tunnel, runner-up only to Tokyo's Yamate Tunnel. The link will consist of twin tunnels, with its deepest point beneath lake Mälaren lying almost 70 m below sea level. Each tunnel will have three lanes of traffic in each direction, supporting an anticipated traffic flow of 140, 000 vehicles daily. During the construction work, 22 million tonnes of rock had to be excavated. Doka Sweden won the contract to provide formwork to four sections; FSE105 Kungens Kurva (King's Curve), FSE502 Hjulsta Norra (North of Hjulsta), FSE61 Akalla and FSE62 Häggvik.

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