|Length:||778 km (483 mi)|
|States:||North Rhine-Westphalia, Lower Saxony, Saxony-Anhalt, Brandenburg, Berlin|
The road heads eastward through the Ruhr Area in the state of North Rhine Westphalia. Here it is identical with A 40. Leaving the Ruhr Area east of Dortmund the B1 travels the more scenic route that shadows the A 2. Here it follows the old trading route Hellweg, crossing cities like Unna, Werl, Soest, Paderborn, Hamelin, Hildesheim and Brunswick. The B1 continues in Magdeburg, Potsdam and Berlin. The road reaches Berlin's city limits at Glienicke Bridge and heads towards the inner city at Alexanderplatz. It leaves Berlin to the eastern side, joined by the Bundesstraße 5 for around 20 km before reaching the Polish border.
The road's eastern terminus is with Polish national road DK22 which crosses the country in an easterly direction.
B1 near Schlangen
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