The key crossing:island=* is used to specify whether a pedestrian crossing has a refuge island (also known as pedestrian island).
This key supersedes the former tag crossing=island.
This is because a crossing island is orthogonal to the rest of the crossing key classification (see also this section on the wiki).
It would be great to see crossing=island removed from the crossing field options, and have a crossing:island field added, similarly to the tactile paving field (i.e. switching between "unknown", "yes" and "no").
As explained in the wiki:
This is because a crossing island is orthogonal to the rest of the
crossing
key classification (see also this section on the wiki).It would be great to see
crossing=island
removed from the crossing field options, and have acrossing:island
field added, similarly to the tactile paving field (i.e. switching between "unknown", "yes" and "no").