Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Austrian autobahns are controlled-access highways in Austria. They are officially called Bundesstraßen A according to the Austrian federal road act (Bundesstraßengesetz). The Austrian Autobahn network has a total length of 1,699 km (1,056 mi) as of 2007. Like in Germany, ideas to built up a limited-access road network with grade separated interchanges had been developed already in the 1920s, including a "Nibelungen" highway along the Danube river from Passau to 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.