 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.