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Bundesautobahn 864 Wikipedia
Bundesautobahn 864 (translates from German as Federal Motorway 864, short form Autobahn 864, abbreviated as BAB 864 or A 864) is an autobahn spur in southwestern Germany, connecting Donaueschingen with Bad Dürrheim.
The A 864 was supposed to be a part of the planned A 86. The current Autobahn still retains its kilometer counter, which counts from 84 to 90.