The centrepiece of the 125 km long, double-track high-speed line between Graz and Klagenfurt is simultaneously the key project for the Baltic-Adriatic-Corridor. The Koralm Tunnel improves the traffic link between Graz and Klagenfurt.
Due to an advantageous layout of tunnel portal and tunnel excavator is was possible to do without shunting bays and laborious shunting during the construction of the single-track railway tunnel.
The double-lane road tunnel is the centrepiece of the Völkermarkt bypass. The town centre is relieved from heavy traffic which in turn means a better quality of life for the population.