The Bundesstraße 3 (abbr. B3) is one of the longest federal highways in Germany. It begins in Buxtehude and continues through Bergen, Celle, Hanover, Alfeld, Einbeck, Göttingen, Kassel, Marburg, Frankfurt am Main, Darmstadt, Heidelberg, Karlsruhe and Freiburg in southwestern Germany and ends at Weil-Otterbach on the border with Switzerland. Between Darmstadt and Wiesloch it is referred to as Ferienstraße Bergstraße. From Wikipedia
