is an autobahn in Germany. It is colloquially known as Ostseeautobahn or Küstenautobahn due to its geographic location near the Baltic Sea coastline.

Construction started in 1992 near the junction Wismar-Nord and was completed in December 2005, when the last section was opened near Tribsees by Chancellor Angela Merkel. Building costs are estimated at 1.8 billion €. 279 km of the autobahn are in Mecklenburg-Vorpommern, 27 km in Brandenburg and 17 km in Schleswig-Holstein, making the A20 the largest continuously built new autobahn since 1945.

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