In context of overlay "Surfaces" – Foot Path – https://osm.org/way/1454896116 via StreetComplete 62.0:

Was soll das für eine Krümmung sein?

Attached photo(s):
https://streetcomplete.app/p/318468.jpg
https://streetcomplete.app/p/318469.jpg
https://streetcomplete.app/p/318470.jpg