The Katschberg Tunnel, which was opened to car traffic in 1974, is a border tunnel located south of central Austria on the Tauern Autobahn. It connects the two regions of Salzburg (south of Oberweißburg, Unterweißburg, and Höf) and Carinthia (north of Saraberg and Mühlbach) via the A10 motorway. Construction of a second tunnel tube began in December 2004 and was completed in April 2008, after which it was opened to traffic. Following construction, the western tube is a total of 5,565 meters (5.5 km) long, and the eastern tube measures 5,898 meters (5.8 km).
The Katschberg Tunnel is classified as a special toll route, meaning it is exempt from the general vignette requirement and instead requires a route-specific toll (special toll). Therefore, additional fees apply for using the Katschberg Tunnel even if you already have a vignette or pay the route-based toll.