A typical problem in Germany: is there a " " in the street name?
I found this "Hammer Straße", which is "Hammerstraße" in OSM.
Both are valid words, but with different meaning.
Hammer Straße is a name in favour of the city "Hamm", Hammerstraße is a name in favour of the tool hammer. Even Google or Viamichelin mix this up, but the street signs show "Hammer Straße".