The Stockholm Bypass is a new 21-km dual, three-lane motorway link that will connect the northern and southern parts of Stockholm, relieving traffic in the city centre. Most of the route, some 18km, will be underground. When completed, it will be one of the longest road tunnels in the world.

Together with ÅF, AECOM delivered design services under two major contracts for the project: an important interchange at Akalla/Häggvik, and rock tunnels to excavate and transport around 19 million tons of rock during construction. When completed, the bypass will comprise two parallel road tunnels, carrying traffic in opposite directions. Both tunnels will have three lanes, increasing to four at the six interchanges along the route.

At their deepest point, the tunnels will be almost 100m below ground. The complicated multilevel interchange at Akalla/Häggvik will connect to the rock tunnels. It involves the construction of new bridges, underpasses, further tunnels and retaining walls, as well as the upgrade of existing structures.

AECOM’s use of Building Information Modelling (BIM) has been key to managing the complexities of this major infrastructure project. The design phase will be delivered by more than 500 people from 19 different disciplines across seven different countries. In 2013, AECOM won the Innovation in Roads category at the Bentley Be Inspired Awards for its use of BIM on the project.

You can read more about AECOM’s use of BIM on the project in Think Ahead magazine.