is an autobahn in Germany. It runs from Heiligenhafen in Schleswig-Holstein to Saarbrücken, a distance of , but is incomplete between Cologne and Trier. B 207 continues north from Heiligenhafen to Puttgarden, at the end of the island of Fehmarn, with a ferry to Rødby, Denmark. The part north of Hamburg is part of the Vogelfluglinie (Migratory Birds Line) and may be one day connected via a fixed link to Denmark (see below). The term Hansalinie (Hansa line) refers to the part from Lübeck (north of Hamburg, thus overlapping the Vogelfluglinie) south to the Ruhr Area (near Dortmund). Overview Schleswig-Holstein In Schleswig-Holstein, the initial section of the A1 (which belongs to the so-called Vogelfluglinie) begins at the junction Heiligenhafen East as a four-lane extension of the B 207 coming from the ferry port Puttgarden on the island of Fehmarn. On the peninsula Wagrien the A 1 briefly runs west, then south, past the East Holstein cities of Oldenburg in Holstein and Neustadt in Holstein. In the area of the Bay of Lübeck, for a length of about 10 km the Baltic Sea coast is touched, which is approached up to about one kilometer at Haffkrug. Before further south the Hanseatic city of Lübeck is reached, at the triangle Bad Schwartau the A1 joins the A 226 coming from Travemünde and becomes a six-lane highway. After crossing the Lübeck city area, there is a connection to the Baltic Sea motorway A 20 in the direction of Rostock on the Lübeck interchange Lübecker Kreuz. From here the highway leads in a southwesterly direction through the district of Stormarn, past the small towns of Reinfeld and Bad Oldesloe to the motorway junction Bargteheide, the current terminus of the A 21 from Kiel. Two eastern suburbs of Hamburg, Bargteheide and Ahrensburg, are also connected. Shortly before reaching the Hamburg city area the A 1 crosses the A 24 (Hamburg-Horn-Berlin) in an elongated crossing construction, the cross Hamburg East (Kreuz Hamburg-Ost). Hamburg At Hamburg, which is passed on its eastern side, the A 1 passes through the suburb of Billstedt and under the Hamburg-Billwerder rail yard in a tunnel that is around 240 meters long. Following this, the A 25 to Geesthacht branches off at the triangle Hamburg South-East. After crossing the Norderelbe on a cable-stayed bridge, the main carriageway of the A 1 at the Hamburg-Süd intersection joins the main carriageway coming from Veddel,