The Süd Autobahn (A2) ('South Motorway') is a motorway (Autobahn) in Austria. Completed in 1999, it runs from the outskirts of Vienna south via the cities of Graz and Klagenfurt to the border of Italy at Arnoldstein, where it joins the Autostrada A23. With a total length of 377.3 km (234.4 mi), the A2 is Austria's longest motorway.

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Quick Facts Motorway A2, Route information ...

Motorway A2
Süd Autobahn A2
Route information
Part of E56 / E66
Maintained by ASFiNAG
Length	377.3 km (234.4 mi)
Major junctions
From	A 23
Major intersections	A 21 near Vienna S4 and S6 near Wiener Neustadt A 9 near Graz A 10 / A 11 near Villach
To	A 23 border with Italy
Location
Country	Austria
Regions	Vienna, Lower Austria, Burgenland, Styria, Carinthia
Major cities	Vienna, Graz, Klagenfurt, Villach
Highway system
Highways of Austria Autobahns Expressways State Roads
← A 1 → A 3

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Plans for the A2 originated from the so-called Reichsautobahn system laid out after the Anschluss annexation of Austria by Nazi Germany in 1938. However, construction had not begun by the outbreak of World War II which terminated all road building projects.

With the first cut of the spade on 6 May 1959, road works were inaugurated on a first section between Vösendorf south of Vienna and Leobersdorf, the segment was opened to the traffic on 26 May 1962. By 1975, the motorway was completed up to Seebenstein in Lower Austria, notably with three lines in each direction. A first segment in Styria between Gleisdorf and Raaba was already opened in 1969, followed by the section between Pörtschach and Villach (then called Wörthersee Autobahn) in Carinthia in 1970. The route was completed with the inauguration of the last segment running from Völkermarkt to Klagenfurt on 25 November 1999.