is an

autobahn The (; German plural ) is the federal controlled-access highway system in Germany. The official German term is (abbreviated ''BAB''), which translates as 'federal motorway'. The literal meaning of the word is 'Federal Auto(mobile) Track' ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. It runs from an interchange with the A 1 at

Bargteheide Bargteheide (West Low German: ''Bartheil'') is a town in the district of Stormarn, Schleswig-Holstein state, Germany. It is situated between the cities of Ahrensburg and Bad Oldesloe, on the Hamburg to Lübeck rail line and is part of the Hambu ...

to Wankendorf, halfway between Bad Segeberg and

Kiel Kiel () is the capital and most populous city in the northern German state of Schleswig-Holstein, with a population of 246,243 (2021). Kiel lies approximately north of Hamburg. Due to its geographic location in the southeast of the Jutland ...

. A northbound extension to

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

(Holstein)

External links

21 A021 A021 {{Germany-road-stub