Unable to answer "How many car lanes does this road have?" – Holyhead Road [B4380] (Secondary Road) – https://osm.org/way/23333358 via StreetComplete 59.0:

It's two lanes merging doen to one,  I don't know if the merging arrow counts as marked lanes or not for this question

Attached photo(s):
https://westnordost.de/p/241557.jpg