A 20
Bundesautobahn 20
Route information
Length	279 km (173 mi)
Existed	1997–present
Location
Country	Germany
States	Schleswig-Holstein, Mecklenburg-Vorpommern, Brandenburg
Highway system
Roads in Germany Autobahns List Federal List State E-roads
← A 19 → A 21

Bundesautobahn 20 (translates from German as Federal Motorway 20, short form Autobahn 20, abbreviated as BAB 20 or A 20) is an autobahn in Germany. The western part was initially planned as Bundesautobahn 22. It is colloquially known as Ostseeautobahn^[1] ("Baltic Freeway") or Küstenautobahn^[2] ("Coastal Freeway") due to its geographic location near the Baltic Sea coastline. The road is not built along a straight line, instead it is built near important cities (Wismar, Rostock, Stralsund), to make it more beneficial for travel between these cities, and also to serve as bypass. On 25 June 2010 the land counsel of Lower Saxony decided that the A22 will be renamed to A20 to show it is a lengthening of the Ostsee- or Küstenautobahn.

Construction started in 1992, only two years after the German reunification, 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 30 km in Schleswig-Holstein, making the A 20 the longest continuously built new autobahn since 1945.

On 28 July 2009 the western extension started with the opening between Autobahnkreuz Lübeck and junction Geschendorf. In the meantime the next six kilometers to the temporary end at Weede has been opened for traffic. The extension and opening of the section between the temporary end in Weede and Autobahnkreuz Bad Segeberg is planned for the end of 2010.^{[needs update]} Further extension west (designated A 22 until June 2010) is planned and awaiting funding, including a tunnel under the Elbe and a 2-way connection with the also-planned A 26.

North of Hamburg the A 20 will have a unique function, namely the connection of the highways A 1, A 21, A 7 and A 23, but it will also function as a northern bypass of the city-region of Hamburg which will take traffic going from France and the Benelux countries to Denmark and Sweden away from Hamburg.

The western part of the A 22 was initially planned as Bundesautobahn 22. It is still in the planning stage and supposed to connect the A 28 near Westerstede with the A 27 near Bremerhaven, crossing the A 29 near Jaderberg . A vital part is the Wesertunnel south of Bremerhaven, which is currently part of Bundesstraße 437. Eastwards of Bremerhaven. The further planning proposes passing Stade and crossing the Elbe river in a tunnel. Details of the trajectory are being discussed in the counties and municipalities involved; the projected start of construction is said to be around 2013.

Planned route of the A 20 through Schleswig-Holstein and Lower Saxony

State	District	Location	km	mi	Exit	Name	Destinations	Notes
Niedersachsen	Ammerland	Bad Zwischenahn			—	Westerstede interchange	A 28 / E22 – Oldenburg, Leer	proposed western endpoint of motorway proposed interchange
		Wiefelstede			—	Wiefelstede	Wiefelstede, Spohle	proposed junction
		Rastede			—	Jaderberg interchange	A 29 – Wilhelmshaven, Oldenburg	proposed interchange
	Wesermarsch	Ovelgönne			—	Ovelgönne	Ovelgönne	proposed junction
		Stadland			—	Stadland	B 437 – Varel, Rödenkirchen	proposed junction
					—	Nordenham	B 212 – Nordenham, Delmenhorst B 437 – Rödenkirchen	proposed rebuild of existing junction
	Weser	Unterweser			Tunnel	Weser Tunnel	Weser river	proposed route through existing tunnel
	Cuxhaven (district)	Loxstedt			—	Dedesdorf	Dedesdorf	proposed rebuild of existing junction
					—/11	Stotel interchange	A 27 / E234 – Bremen, Hannover	proposed rebuild of existing junction proposed concurrency with A 27 motorway (southern terminus)
					10	Bremerhaven-Süd	B 6 – Bremerhaven-Süd, Bremerhaven-Fischereihafen Nesse	junction exists as part of A 27 motorway
					—/9	Loxstedt interchange	A 27 – Bremerhaven, Cuxhaven	proposed rebuild of existing junction proposed concurrency with A 27 motorway (northern terminus)
		Beverstedt			—	Beverstedt-West	B 71 – Beverstedt	proposed junction
					—	Beverstedt-Ost	Freisdorf, Appeln	proposed junction
	Rotenburg (Wümme)	Oerel			—	Bremervörde	B 495 – Hemmoor, Bremervörde	proposed junction
	Stade (district)	Estorf			—	Oldendorf	Oldendorf	proposed junction
		Burweg			—	Himmelpforten	B 73 – Himmelpforten, Cuxhaven	proposed junction
		Drochtersen			—	Kehdingen interchange	A 26 – Stade, Hamburg B 73 – Cuxhaven	proposed interchange
Elbe	Niederelbe	​			Tunnel	Elbtunnel	Elbe river	proposed tunnel
Schleswig-Holstein	Steinburg	Herzhorn			—	Glückstadt	B 431 – Glückstadt, Brunsbüttel, Elmshorn	proposed junction
		Süderau			—	Krempe	Krempe	proposed junction
		Horst			—	Hohenfelde interchange	A 23 – Hamburg, Itzehoe, Heide	proposed interchange
	Pinneberg	Bokel			—	Bokel	Bokel	proposed junction
	Segeberg	Lentföhrden			—	Lentföhrden	B 4 – Bad Bramstedt, Quickborn	proposed junction
					—	Bad Bramstedt interchange	A 7 / E45 – Flensburg, Kiel, Hamburg	proposed junction
		Hartenholm			—	Hartenholm	Struvenhütten, Hartenholm	proposed junction
		Wittenborn			—	Wittenborn	Wittenborn, Wahlstedt	proposed junction
		Högersdorf			—	Bad Segeberg interchange	A 21 – Kiel, Lüneburg	proposed interchange
		Bad Segeberg			—	Bad Segeberg-Ost	B 206 – Bad Segeberg	proposed junction
					—	transition from federal road	B 206 – Bad Segeberg, Itzehoe	Transition from B 206 Current western endpoint of motorway
		Weede			Rest area	Kronsburg	Kronsburg reat area
		Geschendorf			—	Geschendorf	Geschendorf
	Stormarn	Mönkhagen			—	Mönkhagen	Mönkhagen, Stockelsdorf
		Hamberge			1	Lübeck interchange	A 1 / E22 / E47 – Hamburg, Reinfeld, Fehmarn, Puttgarden, Lübeck	western End of concurrency with european route E22
	Lübeck	Moisling			Tunnel	Tunnel Moisling	under Lübeck–Hamburg railway	length: 120 m
		Sankt Jürgen			Bridge	river bridge	over Elbe-Lübeck Canal	length: 180 m
					2a	Lübeck-Genin	Lübeck-Genin
					Rest area	Auf dem Karkfeld	Auf dem Karkfeld rest area
	Herzogtum Lauenburg	Groß Sarau			2b	Lübeck-Süd	B 207 – Lübeck-Süd, Lübeck Airport, Krummesse, Lüneburg, Ratzeburg, ( A 24)
					3	Groß Sarau	Groß Sarau, Groß Grönau
Mecklenburg-Vorpommern	Nordwestmecklenburg	Lüdersdorf			4	Lüdersdorf	Lüdersdorf, Carlow
		Siemz-Niendorf			Rest area	Schönberger Land	Schönberger Land rest area
		Schönberg			5	Schönberg	B 104 – Schönberg, Schwerin, Gadebusch, Rehna	Schwerin is only signed eastbound
		Upahl			6	Grevesmühlen	Grevesmühlen, Boltenhagen, Mühlen, Eichsen
					Rest area	Bretthäger Wisch	Bretthäger Wisch rest area
		Bobitz			7	Bobitz	Bobitz, Bad Kleinen, Gressow
		Barnekow			Rest area	Mölenbarg	Mölenbarg rest area
		Dorf Mecklenburg			8	Wismar-Mitte	B 208 / B 106 – Wismar-Mitte, Schwerin
		Hornstorf			9	Wismar interchange	A 14 – Dresden, Berlin, Schwerin, Insel Poel, Wismar
		Zurow			10	Zurow	B 192 – Zurow, Sternberg
					Rest area	Selliner See	Selliner See rest area
		Glasin			11	Neukloster	Neukloster, Glasin
					Rest area	Fuchsberg	Fuchsberg rest area
	Rostock	Jürgenshagen			12	Kröpelin	Kröpelin, Kühlungsborn, Bützow, Satow
		Satow			Rest area	Fuchsberg	Fuchsberg rest area
		Ziesendorf			13	Bad Doberan	Bad Doberan, Schwaan
					14	Rostock-West	B 103 – Rostock-West, Rostock-Warnemünde, Rostock-Zentrum, Rostock-Überseehafen (toll)	Überseehafen is only signed eastbound tolled destination goes through the Warnow Tunnel
		Polchow			15	Rostock-Südstadt	Rostock-Südstadt
		Dummerstorf			Rest area	Warnowtal	Warnowtal rest area
					16	Rostock interchange	A 19 / E55 – Berlin, Rostock-Überseehafen, Rostock-Warnemünde (toll), Rostock-Ost	Warnemünde is only signed westbound tolled destination goes through the Warnow Tunnel
					17	Dummerstorf	Dummerstorf, Waldeck
		Sanitz			Rest area	Speckmoor	Speckmoor rest area
					18	Sanitz	B 110 – Sanitz, Ribnitz-Damgarten, Tessin, Marlow	Marlow is only signed eastbound
		Thelkow			19	Tessin	B 110 – Tessin, Dargun, Gnioen, Demmin	Dargun, Gnoien and Demmin are only signed eastbound
		Grammow			Rest area	Lindholz	Lindholz rest area
	Vorpommern-Rügen	Lindholz			20	Bad Sülze	Bad Sülze, Barth, Gnoien	Gnoien is only signed westbound
		Tribsees			21	Tribsees	Tribsees, Richtenberg, Marlow	Marlow is only signed westbound
		Gransebieth			Rest area	Trebeltal	Trebeltal rest area
		Wendisch Baggendorf			22	Grimmen-West	Grimmen-West, Glewitz
		Süderholz			23	Grimmen-Ost	B 194 – Grimmen-Ost, Demmin, Loitz, Süderholz-Poggendorf
					24	Stralsund	B 96 / E22 / E251 – Stralsund, Sassnitz, Insel Rügen	eastern end of concurrency with european route E22 western end of concurrency with european route E251
					Rest area	Riedbruch	Riedbruch rest area
					25	Greifswald	B 109 – Greifswald, Süderholz-Poggendorf
	Vorpommern-Greifswald	Görmin			26	Dersekow	Dersekow, Loitz
					Rest area	Peenetal	Peenetal rest area
		Gützkow			27	Gützkow	B 111 – Gützkow, Insel Usedom, Wolgast, Greifswald-Süd	Usedom is only signed eastbound Greifswald-Süd is only signed westbound
		Jarmen			28	Jarmen	B 110 – Jarmen, Dargun, Demmin, Anklam-Nord	Anklam-Nord is only signed eastbound
		Völschow			Rest area	Demminer Land	Demminer Land rest area
	Mecklenburgische Seenplatte	Breest			29	Anklam	B 199 – Anklam, Burow, Insel Usedom	Insel Usedom is only signed westbound
		Werder			30	Altentreptow	Altentreptow, Werder, Stavenhagen
		Brunn			31	Neubrandenburg-Nord	Neubrandenburg-Nord, Neubrandenburg Airport, Friedland i.M., Brunn	Friedland in Mecklenburg is only signed eastbound
		Neverin			Rest area	Vier-Tore-Stadt	Vier-Tore-Stadt rest area
		Friedland			32	Neubrandenburg-Nord	B 110 / E251 – Neubrandenburg-Ost, Neubrandenburg-Zentrum, Glienke	eastern end of concurrency with european route E251
		Groß Miltzow			33	Friedland i.M.	Friedland i.M., Neustrelitz, Woldegk
					Rest area	Brohmer Berge	Brohmer Berge rest area
		Schönhausen			34	Strasburg (Uckermark)	Strasburg (Uckermark)
	Vorpommern-Greifswald	Strasburg (Uckermark)			Rest area	Ravensmühle	Ravensmühle rest area
		Papendorf			35	Pasewalk-Nord	B 110 – Pasewalk-Nord, Ueckermünde, Torgelow	Ueckermünde and Torgelow are only signed eastbound
		Rollwitz			36	Pasewalk-Süd	B 109 – Pasewalk-Süd, Ueckermünde, Torgelow, Prenzlau	Ueckermünde and Torgelow are only signed westbound Prenzlau is only signed eastbound
Brandenburg	Uckermark	Schönfeld			Rest area	Klockow	Klockow rest area
		Rollwitz			37	Prenzlau-Ost	Prenzlau-Ost, Brüssow
		Grünow			38	Prenzlau-Süd	Prenzlau-Süd, Grünow, Eickstedt
		Uckerfelde			39	Uckermark interchange	A 11 / E28 – Berlin, Szczecin (PL)
					—	transition to federal road	B 166 – Schwedt	eastern endpoint of motorway
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Proposed       Route transition

• Bundesautobahn 20 – detailed route plan (in German)