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Major upgrade of Norwegian National Road 23

Photo: Statens Vegvesen

​​The 5.5 km section runs between Daglset in the municipality of Røyken and Linnes in the municipality of Lier 

A multi-billion kroner (NOK) upgrade of the Norwegian National Road 23 will improve both road safety and environment. COWI will draw up the tender documentation and construction plan for the upgraded road that connects the south-western parts of Norway with the southeast of Sweden.

The plan is for a new four-lane road on the section between Dagslett in Røyken municipality and Linnes in Lier municipality in the southwest of Norway. The road is to replace the present section which is built to a poor standard and is an environmental issue for the people living along it. 

The existing road does not meet the present requirements for width, curvature, exits, crossings and speed limits. Today’s local and through traffic creates major environmental and road safety problems for local residents.

“The project will bring great social benefit in terms of road safety, the environment and access to the sea. For us planners, it also presents particularly exciting technical challenges in soil mechanics, geology and hydrogeology,” says COWI’s project manager, Frode Geir Bjørvik.
The new section is part of the improvement of the Rv 23 Oslofjord link outside the Norwegian capital, which connects south-western parts of Norway with the southeast of Sweden.

Major conservation areas

The road runs close to the Linnesstranda nature reserve with its wealth of plant and bird life. The construction and operation of the Rv 23 therefore has to be managed in such a way that there is no indirect adverse impact on these natural assets from run-off, changes in the water balance or noise. 
“Throughout the planning, the Norwegian Public Roads Administration has been concerned to ensure that any direct or indirect impact on the Linnesstranda nature reserve is kept to a minimum,” says Bjørvik.
The project also has to consider the local road network and footpaths and cycle paths along the route, and measures will be planned to limit noise and make provision for wildlife.

Tunnel and road

The section is 5.5 km long, including 2.2 km of tunnel. Without the new tunnel, there would be around 29,800 vehicles on the existing road in 2040; this will be reduced to around 7,500 vehicles with the new road.
As well as project planning, COWI's assignment with the Norwegian Public Roads Administration also covers follow-up in the construction phase. The contract is worth approx. NOK 45.5 million.

Priority section

The project has a high profile, with State funding under the National Transport Plan (NTP) 2014–23, and is part of a priority traffic route between Vestfold and Østfold. The construction is to be financed through tolls and State funding. The total cost is estimated at NOK 2.1 billion at 2014 prices.

Planning of the project will continue through 2015 and 2016. It is planned to start preparatory work in 2016, before construction gets under way for real in 2017. The new road should then be finished by 2021.

LAST UPDATED: 16.02.2017