After crossing the river Aller at Rethem in Soltau-Fallingbostel district it passes through the villages of Groß Eilstorf and Kirchboitzen before entering the one-way system in the town centre of Walsrode. This is a traffic bottleneck which causes delays during the rush hour.
The B 209 then passes through Honerdingen, before reaching junction 47 on the A 7 autobahn located in Bad Fallingbostel's industrial estate.
To 1 July 1989 a section between Bad Fallingbostel and Soltau, part of the present day L 163 state road, was designated as Bundesstraße 209. As a result of the parallel routing of the A 7 autobahn, this section was downgraded however. In Bad Fallingbostel the autobahn slip road (then an independent branch) to the A 7 was designated the B 209a. When the road between Bad Fallingbostel and Soltau was downgraded on 1 July 1989 the slip road became part of the B 209. Its distance is separately measured however.
Route / Junctions
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