PROJECT | STOCKHOLM BYPASS


BYPASS PROGRESSES STOCKHOLM – THE FÖRBIFART


The new Stockholm Bypass is long needed and so extensive that construction has taken many years. With works well advanced, Björn Stille, who was Design Manager


for Rock and Grouting Manager in the Afry/Aecom JV, and client Trafikverket’s Project Manager, Camilla Magnusson, discussed the project challenges with Julian Champkin for T&TI


E4 Förbifart Stockholm translates to English as the Stockholm Bypass; which somewhat understates what it is. A big project. “Actually it is a huge project,” says Björn Stille, who


was Design Manager for Rock and Grouting Manager with Afry/Aecom JV on the project. The JV supported the client as design consultant. Stockholm Bypass is 21km in length with


approximately 18km underground (tunnel lengths of 16km and 1.8km, respectively). In tunnelling terms, double that distance given the


twin main tubes. Then, add in the tunnelling works for cross passages located every 100m along the main


tunnels, and spaced at 150m intervals on the ramps - of which there are many, along with a few access tunnels for the construction phase. The total length of tunnelling on the major road project in the Swedish capital is about 55km. The project will carry three lanes of traffic in each


direction. There are six interchanges. The route passes under Lake Mälaren, and does so at a depth of 65m below water level. “It is twice as long as Sweden’s previously longest


tunnel, and that one is a rail tunnel,” says Stille. This will be the world’s third longest road tunnel that is part of the infrastructure of a city.


Above: Underground construction underway on E4 Förbifart Stockholm (‘Stockholm Bypass’) IMAGES COURTESY OF TRAFIKVERKET; BJÖRN STILLE, EXCEPT WHERE NOTED


14 | April 2025


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