Unable to answer "How many car lanes does this road have?" – Selfhelpweg (Minor/Unclassified Road) – https://osm.org/way/6555039 via StreetComplete 58.2:

There is some kind of bicycle lane marking on both sides but I don't see a specific option to mark this.

Attached photo(s):
https://westnordost.de/p/233023.jpg