In http://www.openstreetmap.org/edit?editor=remote#map=19/51.32000/6.49810 the South->North Wilhelmplatz highway is designated to be used only buses (access=designated, psv=yes), however, OSRM routes through that road in the car profile when you go from "Benrader Straße, Tönisvorst" to "Bahnstraße, Tönisvorst" (generating a link failed).
In http://www.openstreetmap.org/edit?editor=remote#map=19/51.32000/6.49810 the South->North Wilhelmplatz highway is designated to be used only buses (access=designated, psv=yes), however, OSRM routes through that road in the car profile when you go from "Benrader Straße, Tönisvorst" to "Bahnstraße, Tönisvorst" (generating a link failed).