Full extension Klaus Tunnel chain

The Klaus tunnel chain along the A9 Phyrn motorway was built in 1996 in the first construction phase. In the second construction phase, the 4 tunnels were extended by a second tube and the 6 bridge structures were renovated.

The Klaus tunnel chain passes along the Upper Austrian A9 Pyhrn motorway starting at Klaus, continuing along the Klaus reservoir at the foot of the Limestone Alps and finally ends at Dirnbach. The chain of tunnels was initially built in 1996, and in the second construction phase, beginning in 2013, it was fully expanded. This chain of tunnels consists of 4 tunnels and 6 bridge structures, which were renovated on the one hand and newly built on the other.