Bundesautobahn 21
Federal motorway in Germany
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Bundesautobahn 21 (translates from German as Federal Motorway 21, short form Autobahn 21, abbreviated as BAB 21 or A 21) is an autobahn in Germany.
Length50 km (31 mi)
NorthendBundesstraße 404 in Klein Barkau, Schleswig-Holstein
SouthendBundesautobahn 1 in Hammoor, Schleswig-Holstein
CountryGermany
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| Bundesautobahn 21 | ||||
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| Route information | ||||
| Length | 50 km (31 mi) | |||
| Major junctions | ||||
| North end | Bundesstraße 404 in Klein Barkau, Schleswig-Holstein | |||
| South end | Bundesautobahn 1 in Hammoor, Schleswig-Holstein | |||
| Location | ||||
| Country | Germany | |||
| States | Schleswig-Holstein, Lower Saxony (planned) | |||
| Highway system | ||||
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It runs from an interchange with the A 1 at Bargteheide to Wankendorf, halfway between Bad Segeberg and Kiel. A northbound extension to Kiel and a southbound extension connecting to the A 39 are being planned. The A 21 will cross the extension of the A 20 near Bad Segeberg.
In 2026, the A21 will be completed until Klein Barkau.[1][2]
The A21 is planned to end at the Barkau Interchange when it's completed.[3]
Exit list
| State | District | Location | km | mi | Exit | Name | Destinations | Notes |
|---|---|---|---|---|---|---|---|---|
| Schleswig-Holstein | Kiel | Gaarden-Süd and Kronsburg | — | Kiel-Barkauer Kreuz |  B 76 – Eckernförde, Lübeck B 202 – Lütjenburg, Rendsburg ( A 210) | proposed northern endpoint of motorway | ||
| — | Kiel-Molfsee | Schulensee ( B 202 – Lütjenburg) | Proposed junction
Planned Südspange will start here | |||||
| Moorsee | Bridge | Eisenbahnbrücke | Hamburg-Altona–Kiel railway | Proposed bridge | ||||
| — | Kiel-Neumeimersdorf | Kiel-Meimersdorf | Junction currently part of the B 404 | |||||
| — | Kiel-Wellseedamm | Kiel-Wellsee, Kiel Elmschenhagen | Junction currently part of the B 404 | |||||
| — | Kiel-Industrieareal Wellsee | Kiel-Industrieareal Wellsee | Junction proposed | |||||
| Plön (district) | Boksee | — | Boksee/Havighorst | Boksee, Havighorst | Junction proposed | |||
| Klein Barkau | 5 | Klein Barkau | Klein Barkau, Kirchbarkau | Junction under construction | ||||
| Löptin | — | transition from federal road |  B 404 – Kiel | Transition from B 404
Current northern endpoint of motorway | ||||
| Stolpe | 6 | Nettelsee | Nettelsee, Plön, Bordesholm | |||||
| Rest area | Depenauer Moor | Depenauer Moor | Access only southbound | |||||
| 7 | Wankendorf | Wankendorf, Stolpe | ||||||
| Segeberg | Bornhöved | 8 | Bornhöved |  B 430 – Bornhöved, Neumünster, Plön, Eutin | Eutin is only signed southbound | |||
| 9 | Trappenkamp | Trappenkamp, Rickling | Rickling is only signed southbound | |||||
| Daldorf | 10 | Daldorf | Daldorf, Rickling | Rickling is only signed northbound | ||||
| Negernbötel | 11 | Wahlstedt |  B 205 – Flensburg (  A 7 / E45), Neumünster, Wahlstedt | Flensburg and Neumünster are only signed northbound | ||||
| Schackendorf | Rest area | Schackendorf | Schackendorf rest area | |||||
| — | Schackendorf | Schackendorf | Incomplete Junction: Only one entrance northbound
Slip road closed in 2021 | |||||
| 12 | Bad Segeberg-Nord | Bad Segeberg, Schackendorf | Proposed exit
Exit will be built along the A 20 extension | |||||
| Bridge | Straßen- und Eisenbahnbrücke | Neumünster–Bad Oldesloe railway | ||||||
| Bad Segeberg | 12 | Bad Segeberg-Nord |  B 206 – Itzehoe, Lübeck ( A 20), Bad Segeberg-Nord, Bad Segeberg-Möbel Kraft | Exit will be closed along the A 20 extension | ||||
| Högersdorf | 13 | Bad Segeberg interchange | A 20 – Bremerhaven, Lübeck | interchange proposed | ||||
| 13 | Bad Segeberg-Süd |  B 432 – Bad Segeberg-Süd, Hamburg Airport | Hamburg Airport is only signed southbound
Exit will be closed along the A 20 extension | |||||
| Mözen | 14 | Schwissel | Schwissel | |||||
| Schwissel | Rest area | Schwisseler Kamp | Schwisseler Kamp rest area | |||||
| Neversdorf | 15 | Leezen | Leezen | |||||
| Stormarn | Bad Oldesloe | 16 | Bad Oldesloe-Nord | Nütschau, Tralau, Borstel, Bad Oldesloe-Nord | ||||
| 17a | Bad Oldesloe-Süd |  B 75 – Bad Oldesloe-Süd | ||||||
| Rümpel | 17b | Rümpel | Rümpel | incomplete junction: only one entrance northbound | ||||
| Tremsbüttel | Bridge | Straßen- und Eisenbahnbrücke | Lübeck–Hamburg railway | |||||
| 18 | Tremsbüttel | Tremsbüttel | ||||||
| Rest Area | Rehbrook | Rehbrook rest area | ||||||
| Hammoor | 19 | Bargteheide interchange |   A 1 / E22 – Bremen, Hannover, Hamburg, Ahrensburg | incomplete interchange: no exit/entrance ramp: Kiel ↔ Lübeck, no exit/entrance ramp: Hamburg ↔ Schwarzenbek, no exit ramp Schwarzenbek → Lübeck | ||||
| — | transition to federal road | B 404 – Schwarzenbek | Transition to B 404
Current southern endpoint of motorway | |||||
| — | Bargteheide | Bargteheide, Hammoor | Proposed junction | |||||
| Todendorf | — | Todendorf/Mollhagen | Todendorf, Mollhagen | Proposed junction | ||||
| Steinburg, Stormarn | — | Todendorf/Sprenge | Todendorf, Sprenge | Proposed junction | ||||
| Lütjensee | — | Lütjensee/Schönberg | Lütjensee, Schönberg | Proposed junction | ||||
| Grönwohld | — | Lütjensee/Grönwohld | Lütjensee, Grönwohld | Proposed junction | ||||
| Trittau | — | Trittau-Nord | Trittau, Großensee | Proposed junction | ||||
| Grande | — | Trittau-Süd | Trittau, Grande | Proposed junction | ||||
| Herzogtum Lauenburg | Kasseburg | — | Schwarzenbek/Grande interchange |   A 24 / E26 – Hamburg, Berlin | Proposed interchange | |||
| Sachsenwald | — | Schwarzenbek-Nord |  B 209 – Schwarzenbek | Proposed junction | ||||
| Schwarzenbek | Bridge | Eisenbahnbrücke | Berlin-Hamburg railway | Proposed bridge | ||||
| — | Schwarzenbek-West |  B 207 – Hamburg-Bergedorf, Schwarzenbek | Proposed junction | |||||
| Hohenhorn | — | Geesthacht-Nord |  B 5 – Lauenburg | Proposed junction | ||||
| Escheburg | — | Geesthacht interchange |  A 25 – Hamburg | Proposed interchange | ||||
| Elbe | Elbe | Elbe | Bridge | Elbe river | Elbe river bridge | Proposed bridge | ||
| Niedersachsen | Harburg (district) | Marschacht | — | Marschacht-Rönne | Marschacht, Rönne | Proposed junction | ||
| — | Marschacht-Eichholz | Marschacht, Eichholz | Proposed junction | |||||
| Handorf | — | Handorf | Handorf, Rottdorf | Proposed junction | ||||
| Bardowick | — | Handorf interchange |  A 39 – Hamburg, Lüneburg | Proposed junction
proposed southern endpoint of motorway | ||||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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