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 (Holstein) |} External links 21 A021 A021