Bundesautobahn 21

A 21
A 21
Bundesautobahn 21
Route information
Length	50 km (31 mi)
Location
Country	Germany
States	Schleswig-Holstein, Lower Saxony (planned)
Highway system
	Roads in Germany; Autobahns List; ; Federal List; ; State; E-roads;

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
		Gaarden-Süd and Kronsburg	—	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
		Bornhöved	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
		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
		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
		Bad Oldesloe	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 reat 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	—	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	—	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 Closed/former Incomplete access Proposed Route transition

External links

Bundesautobahn 21 – detailed route plan (in German)

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Autobahn system in Germany
Major routes	A 1 A 2 A 3 A 4 A 5 A 6 A 7 A 8 A 9	German Autobahn symbol
Regional routes	A 10 A 11 A 12 A 13 A 14 A 15 A 17 A 19 A 20 A 21 A 23 A 24 A 25 A 26 A 27 A 28 A 29 A 30 A 31 A 33 A 36 A 37 A 38 A 39 A 40 A 42 A 43 A 44 A 45 A 46 A 48 A 49 A 52 A 57 A 59 A 60 A 61 A 62 A 63 A 64 A 65 A 66 A 67 A 70 A 71 A 72 A 73 A 81 A 92 A 93 A 94 A 95 A 96 A 98 A 99
Local routes	A 100 A 103 A 111 A 113 A 114 A 115 A 117 A 143 A 210 A 215 A 226 A 252 A 253 A 255 A 261 A 270 A 280 A 281 A 293 A 352 A 369 A 391 A 392 A 445 A 448 A 480 A 485 A 516 A 524 A 535 A 542 A 544 A 553 A 555 A 559 A 560 A 562 A 565 A 571 A 573 A 602 A 620 A 623 A 643 A 648 A 650 A 656 A 659 A 661 A 671 A 672 A 831 A 861 A 864 A 952 A 980 A 995
Planned or former routes	A 16 A 17* A 18 A 22 A 32 A 34 A 35 A 36 A 40* A 41 A 47 A 50 A 51 A 53 A 54 A 55 A 56 A 69 A 74 A 75 A 77 A 80 A 82 A 83 A 84 A 85 A 86 A 87 A 88 A 89 A 90 A 91 A 102 A 104 A 105 A 106 A 107 A 140 A 201 A 205 A 227 A 241 A 250 A 263 A 282 A 290 A 314 A 339 A 369 A 376 A 388 A 395 A 430 A 432 A 441 A 441* A 443 A 451 A 480* A 533 A 540 A 545 A 552 A 558 A 580 A 610 A 621 A 647 A 652 A 653 A 654 A 655 A 680 A 683 A 687 A 713 A 720 A 722 A 731 A 751 A 752 A 753 A 828 A 833 A 834 A 840 A 860 A 862 A 863 A 863* A 881 A 895 A 921 A 922 A 942 A 944 A 985 A 990 A 991 A 992 A 993 A 994 A 996 A 997 A 998 A 999
See also	Reichsautobahn (history) Autobahnpolizei
* original plan: number is used by another route now