For a long time the single-tube Pfänder Tunnel has been the busiest highway tunnel in Austria with an average of 27,000 vehicles per day.
A second parallel tunnel tube was planned to get the traffic problem under control. In September 2008 the Single Shield TBM – christened "Angelika" – started boring its way through molasse formations. For the first time a road tunnel was driven by machine in Austria. The S-474 Shield with a diameter of 11,835mm successfully completed the tunnel with a length of 6,500 meters in 14 months, arriving at the target shaft on November 13, 2009.
On July 26, 2012, the second Pfänder Tunnel Tube was put into operation.
Pfänder Tunnel (German)