Tagging "Sandbox" on the side of a road

How would you tag this item?
It’s a public sandbox used on roads with less plowing during wintertime.

https://www.mapillary.com/map/im/tU7xwiQ4qgKWq6ZcRw6BKQ

That’s a grit bin: https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dgrit_bin

Thanks :slight_smile: