The quality of life in Salzburg's northern suburb of Liefering will be significantly improved once the autobahn near the Salzburg Mitte exit has been fully enclosed. As well as physically re-uniting the two halves of the district - long separated by the road - the 500m long cut and cover tunnel will also drastically reduce traffic noise.
The twin-tube tunnel has a constant width, but three traffic lanes at one end increase to five at the junctions with Salzburg Mitte autobahn, and then decrease to four lanes.
Two tunnel-formwork units - one for the three lane and another for the four-lane section - travelled towards one another from opposite ends of the tunnel towards the central stretch where a third travelling unit with a variable width extension was working.
All formwork for the project was supplied ready assembled by Doka.