What I've meant is: The following paths are marked blue/white in reality:
https://www.openstreetmap.org/way/41921317
https://www.openstreetmap.org/way/35930982
especially for this I was surprised (and still don't really believe I looked rightfully at the sign)
https://www.openstreetmap.org/way/493513026
and those really aren't hard even easier than https://www.openstreetmap.org/way/377330443 which in reality is marked "red-white"