# Bundesautobahn 21

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.
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.

## Exit list

| State | District | Location | 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 |
| Schleswig-Holstein | Kiel | Gaarden-Süd and Kronsburg | — | Kiel-Molfsee | Schulensee ( B 202 – Lütjenburg) | Proposed junction Planned Südspange will start here |
| Schleswig-Holstein | Kiel | Moorsee | Bridge | Eisenbahnbrücke | Hamburg-Altona–Kiel railway | Proposed bridge |
| Schleswig-Holstein | Kiel | Moorsee | — | Kiel-Neumeimersdorf | Kiel-Meimersdorf | Junction currently part of the B 404 |
| Schleswig-Holstein | Kiel | Moorsee | — | Kiel-Wellseedamm | Kiel-Wellsee, Kiel Elmschenhagen | Junction currently part of the B 404 |
| Schleswig-Holstein | Kiel | Moorsee | — | Kiel-Industrieareal Wellsee | Kiel-Industrieareal Wellsee | Junction proposed |
| Schleswig-Holstein | Plön (district) | Boksee | — | Boksee/Havighorst | Boksee, Havighorst | Junction proposed |
| Schleswig-Holstein | Plön (district) | Klein Barkau | 5 | Klein Barkau | Klein Barkau, Kirchbarkau | Junction under construction |
| Schleswig-Holstein | Plön (district) | Löptin | — | transition from federal road | B 404 – Kiel | Transition from B 404 Current northern endpoint of motorway |
| Schleswig-Holstein | Plön (district) | Stolpe | 6 | Nettelsee | Nettelsee, Plön, Bordesholm | |
| Schleswig-Holstein | Plön (district) | Stolpe | Rest area | Depenauer Moor | Depenauer Moor | Access only southbound |
| Schleswig-Holstein | Plön (district) | Stolpe | 7 | Wankendorf | Wankendorf, Stolpe | |
| Schleswig-Holstein | Segeberg | Bornhöved | 8 | Bornhöved | B 430 – Bornhöved, Neumünster, Plön, Eutin | Eutin is only signed southbound |
| Schleswig-Holstein | Segeberg | Bornhöved | 9 | Trappenkamp | Trappenkamp, Rickling | Rickling is only signed southbound |
| Schleswig-Holstein | Segeberg | Daldorf | 10 | Daldorf | Daldorf, Rickling | Rickling is only signed northbound |
| Schleswig-Holstein | Segeberg | Negernbötel | 11 | Wahlstedt | B 205 – Flensburg ( A 7 / E45), Neumünster, Wahlstedt | Flensburg and Neumünster are only signed northbound |
| Schleswig-Holstein | Segeberg | Schackendorf | Rest area | Schackendorf | Schackendorf rest area | |
| Schleswig-Holstein | Segeberg | Schackendorf | — | Schackendorf | Schackendorf | Incomplete Junction: Only one entrance northbound Slip road closed in 2021 |
| Schleswig-Holstein | Segeberg | Schackendorf | 12 | Bad Segeberg-Nord | Bad Segeberg, Schackendorf | Proposed exit Exit will be built along the A 20 extension |
| Schleswig-Holstein | Segeberg | Schackendorf | Bridge | Straßen- und Eisenbahnbrücke | Neumünster–Bad Oldesloe railway | |
| Schleswig-Holstein | Segeberg | 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 |
| Schleswig-Holstein | Segeberg | Högersdorf | 13 | Bad Segeberg interchange | A 20 – Bremerhaven, Lübeck | interchange proposed |
| Schleswig-Holstein | Segeberg | Högersdorf | 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 |
| Schleswig-Holstein | Segeberg | Mözen | 14 | Schwissel | Schwissel | |
| Schleswig-Holstein | Segeberg | Schwissel | Rest area | Schwisseler Kamp | Schwisseler Kamp rest area | |
| Schleswig-Holstein | Segeberg | Neversdorf | 15 | Leezen | Leezen | |
| Schleswig-Holstein | Stormarn | Bad Oldesloe | 16 | Bad Oldesloe-Nord | Nütschau, Tralau, Borstel, Bad Oldesloe-Nord | |
| Schleswig-Holstein | Stormarn | Bad Oldesloe | 17a | Bad Oldesloe-Süd | B 75 – Bad Oldesloe-Süd | |
| Schleswig-Holstein | Stormarn | Rümpel | 17b | Rümpel | Rümpel | incomplete junction: only one entrance northbound |
| Schleswig-Holstein | Stormarn | Tremsbüttel | Bridge | Straßen- und Eisenbahnbrücke | Lübeck–Hamburg railway | |
| Schleswig-Holstein | Stormarn | Tremsbüttel | 18 | Tremsbüttel | Tremsbüttel | |
| Schleswig-Holstein | Stormarn | Tremsbüttel | Rest Area | Rehbrook | Rehbrook rest area | |
| Schleswig-Holstein | Stormarn | 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 |
| Schleswig-Holstein | Stormarn | Hammoor | — | transition to federal road | B 404 – Schwarzenbek | Transition to B 404 Current southern endpoint of motorway |
| Schleswig-Holstein | Stormarn | Hammoor | — | Bargteheide | Bargteheide, Hammoor | Proposed junction |
| Schleswig-Holstein | Stormarn | Todendorf | — | Todendorf/Mollhagen | Todendorf, Mollhagen | Proposed junction |
| Schleswig-Holstein | Stormarn | Steinburg, Stormarn | — | Todendorf/Sprenge | Todendorf, Sprenge | Proposed junction |
| Schleswig-Holstein | Stormarn | Lütjensee | — | Lütjensee/Schönberg | Lütjensee, Schönberg | Proposed junction |
| Schleswig-Holstein | Stormarn | Grönwohld | — | Lütjensee/Grönwohld | Lütjensee, Grönwohld | Proposed junction |
| Schleswig-Holstein | Stormarn | Trittau | — | Trittau-Nord | Trittau, Großensee | Proposed junction |
| Schleswig-Holstein | Stormarn | Grande | — | Trittau-Süd | Trittau, Grande | Proposed junction |
| Schleswig-Holstein | Herzogtum Lauenburg | Kasseburg | — | Schwarzenbek/Grande interchange | A 24 / E26 – Hamburg, Berlin | Proposed interchange |
| Schleswig-Holstein | Herzogtum Lauenburg | Sachsenwald | — | Schwarzenbek-Nord | B 209 – Schwarzenbek | Proposed junction |
| Schleswig-Holstein | Herzogtum Lauenburg | Schwarzenbek | Bridge | Eisenbahnbrücke | Berlin-Hamburg railway | Proposed bridge |
| Schleswig-Holstein | Herzogtum Lauenburg | Schwarzenbek | — | Schwarzenbek-West | B 207 – Hamburg-Bergedorf, Schwarzenbek | Proposed junction |
| Schleswig-Holstein | Herzogtum Lauenburg | Hohenhorn | — | Geesthacht-Nord | B 5 – Lauenburg | Proposed junction |
| Schleswig-Holstein | Herzogtum Lauenburg | 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 |
| Niedersachsen | Harburg (district) | Marschacht | — | Marschacht-Eichholz | Marschacht, Eichholz | Proposed junction |
| Niedersachsen | Harburg (district) | Handorf | — | Handorf | Handorf, Rottdorf | Proposed junction |
| Niedersachsen | Harburg (district) | 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 Closed/former Incomplete access Proposed Route transition |||||||||