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Bundesstraße 455 (abbreviated B-455) is a German Bundesstraße (German for "federal highway") in the federal state of Hesse. The route runs southwest from Schotten in Vogelsbergkreis to Mainz-Kastel, a borough of the Hessian capital city of Wiesbaden.
Bundesstraße 455 originally went through Bad Homburg vor der Höhe and Friedrichsdorf. These parts of the route were replaced by the A-5 and A-661 sections, and the original highway has now been downgraded to a state road (Landesstraße). Nevertheless, the signs on B-455 from Königstein as well as from Friedberg continue to refer to Bad Homburg.
From Oberursel-Nord, Bundesstraße 455 then takes the so-called "Northern Bypass" (Nordumgehung) around Oberursel. Before this tunnel was built, the route originally went through Oberursel. After its construction, the former route was downgraded to a state road (L 3004) and a district highway (Kreisstraße, K 772).