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Highway 4, between the municipalities of Roa and Gran, there were several challenges that needed to be solved. For instance, how to build a four-lane highway through a swamp without destroying it? In addition, there turned out to be a lot of quick clay in the ground, a special kind of clay that is prone to collapse and become liquid under pressure. Furthermore, a limited carbon footprint was an important project requirement.
Read through this case study to get further insights.
New four-lane motorway that will increase capacity and reduce the risk of accidents on the Roa-Gran stretch.
The client is the Norwegian Public Roads Administration. Turnkey contracted with the combination of Hæhre-Isachsen as contractor and COWI as designer.
The budget is just over NOK 700 million.
Construction start: September 2021, opening November 2023.