continues as N4 to Strasbourg Baden-Württemberg Ortenau district (OG number plates) Freudenstadt district (FDS number plates) Calw district (CW number plates) Böblingen district (BB number plates) Tübingen district (TÜ number plates) Reutlingen district (RT number plates) together with the B 465 in the direction of Bad Zainingen together with the B 465 in the direction of Bad Urach Alb-Donau district (UL number plates) Ulm (UL number plates) together with the B 10 in the direction of Neu-Ulm Bavaria Neu-Ulm district (NU number plates) together with the B 10 in the direction of Ulm Bundesstraße 28 or B 28 is a German federal road.

The road runs west through Baden-Württemberg from the eastern terminus of the French route nationale 4 in Strasbourg, after crossing the Rhine river in Kehl, to Senden in Bavaria, where it terminates into the A7.

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