Unable to answer "How many car lanes does this road have?" for https://osm.org/way/934802117 via StreetComplete 55.1:

This is a single lane access road. It ends with essentially a short foot path with a single stair/footlanding for pedestrians.

Attached photo(s):
https://westnordost.de/p/192386.jpg
https://westnordost.de/p/192387.jpg