is a motorway in southern Germany, leading from the Austrian border (A14) near Lindau (Lake Constance) through Memmingen, Landsberg am Lech to Munich. Two European routes lead through the autobahn: E 43 and E 54. It was first planned to build a direct connection between Munich and Lindau before World War II, south of Ammersee. During the 1972 Summer Olympics in Munich, a section from Munich to Oberpfaffenhofen and Germering was built. A 25 km part of the road during those games were used for the road team time trial cycling event. The last two-laned section, from Wangen-Nord to Leutkirch-Süd, was upgraded in 2009.

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