vehicle road network of Germany of the study company for automotive road construction (STUFA) of 1926 a highway Würzburg-Ulm-Lindau was provided, detail planning took place from 1935 to 1941. In 1969, the states of Bavaria and Baden-Württemberg were able to agree on a line parallel to the federal highway 19. From 1972 first sections could be released. It started with the Berkheim section to junction Memmingen-Süd (9.4 km) and the first 27.1 km long directional lane between Bad Grönenbach and Kempten-Leubas. Major sections were between Kreuz Biebelried and junction Uffenheim-Langensteinach (34.7 km) in 1980, the southern extension to the junction Feuchtwangen (42.1 km) in 1985 and further to the junction Heidenheim (59.6 km) opened in 1987. Since the last 6.8 kilometers to the junction Oy-Mittelberg were already released a year ago, the highway was already passable from Denmark to the Allgäu. In 1992, the A7 was extended by another 4.9 km to Nesselwang. A few meters west of the junction of the same name is the highest motorway point in Germany: "914.081 m above sea level. NN ". In July 1999, the opening of the border tunnel Füssen to Tyrol followed with a tube and two lanes. The tunnel is supposed to relieve the surrounding communities of the high traffic volume during vacation time. In 2005, the northern adjoining first directional lane was opened up to the county road at Gunzenberg. Until September 2009, traffic from the end of the motorway at Nesselwang was routed via various routes for cars and trucks to the border tunnel, which often led to traffic jams. On 1 September 2009 was the official inauguration of the last 15-kilometer section, which was released more than a year late. The viaduct Enzenstetten was initially only one-way passable, as the construction-performing consortium could not complete it on time. The second half of the bridge went into operation in December 2010, to the Austrian border. Recent changes The highway is from the Danish border to the Bordesholmer triangle with the A 215 four-lane expanded. To triangle Hamburg northwest with the A 23 are several sections since 2016/2017 six-lane, the remaining four-lobed sections are expected to end of 2019 six lanes expanded. It follows a six-lane section to the junction Hamburg-Bahrenfeld. Thereafter, eight lanes will be available in the Elbtunnels area. In the further course there are again six lanes, between the triangle Hamburg-southwest (A 261) and the Horster