Unable to answer "How wide is the foot path here?" – Foot Path – https://osm.org/way/859099903 via StreetComplete_ee 59.2:

This entire centre island is a sidewalk. It's over 3m from the shelter to the north road, and over 2m from the shelter to the south road. Not sure if sidewalk width makes sense here?

Attached photo(s):
https://westnordost.de/p/251066.jpg