Autobahns of Austria  The Austrian autobahns are controlled-access highways in Austria. They are officially called "Bundesstraßen A (Bundesautobahnen)" under the authority of the Federal Government according to the Austrian Federal Road Act ("Bundesstraßengesetz"), not to be confused with the former "Bundesstraßen" highways maintained by the Austrian states since 2002. Ideas to build up a limited-access road network with grade separated interchanges had been developed already in the 1920s, including a "Nibelungen" highway along the Donau (Danube) river from Passau to Wien (Vienna) and further on towards Budapest. Those plans however had never been carried out due to the lasting economic crisis that hit the country after the dissolution of Austria-Hungary in 1918, exacerbated by the Great Depression. The first autobahn on Austrian territory was the West Autobahn from Salzburg to Wien. Building started immediately after the Austrian Anschluss in 1938 [the annexation of Austria] on order of Adolf Hitler as extension of the German "Reichsautobahn-Strecke 26" from München (Munich) (the present-day Bundesautobahn 8). However, only including the branch-off of the planned Tauern Autobahn had been finished on 13 September 1941. Construction works discontinued the next year due to World War II. After the war delaying resistance by the Soviet occupation forces as well as claims raised by West Germany to the former "Reichsautobahn" assets obstructed the resumption until 1954. Construction started in the US-occupied zone of Salzburg and Upper Austria, partly relying on the pre-war planning, and were extended after the country gained full sovereignty by the 1955 Austrian State Treaty. The first section of the West Autobahn up to Mondsee was opened in 1958, by 1967 the route between Salzburg and Wien / Vienna was completed. From 1959 onwards the Süd Autobahn was built to reach the southern state capitals of Graz and Klagenfurt from Wien / Vienna. The construction of the Tauern Autobahn was not resumed until 1969. The Inn Valley Autobahn in the western state of Tyrol was built from 1968 onwards, up to today it is not directly connected to the main Austrian autobahn network, as via motorway drivers have to use the German autobahns BAB 8 and 93 along the "Deutsches Eck" link.