[Tagging] What qualifies as crossing=unmarked

[Jeroen Hoek]

Cases 1 and 3 are what I would consider cases of crossing=unmarked.
These are places designed as pedestrian crossing places with
accessibility in mind. They lack road markings, but the lowered kerbs
make it clear that this is where you would cross if you were in a
wheelchair or pushing a pram. When sidewalks are mapped separately, this
is where you would want to have them cross the street.

Case 2, the driveway, not really. In fact, the sidewalk/pavement
continues over the driveway, which in many jurisdictions means that
pedestrians have right of way, and the the sidewalk is not interrupted.
The driveway is crossing the sidewalk, not the other way around. No tag
necessary I think when the way is a highway=service.

When the way is highway=residential or higher, some tag to indicate this
kind of 'sidewalk continues uninterrupted, street crosses it' is lacking
I think. These are common in the Netherlands, for example:

https://postimg.cc/k6HpPxHK

The sidewalk (and the cycleway) continue across that side street running
of to the top of the photograph. I wouldn't tag these with
crossing=unmarked, but some tag for these is missing.

Case 4 lacks a clear place to cross. It is up to the pedestrian
themselves to choose where. In these cases crossing=unmarked does not
feel appropriate. I don't know if some other crossing-tag would be
useful for this. Personally I tag the section of highway=footway
crossing here with footway=link (continuing with footway=sidewalk after
leaving the carriage way) to indicate that this is a crossing mapped for
routing purposes, but that it lacks a formal on the ground crossing
place (for places where crossing=* is appropriate footway=crossing is
used). Mapping the kerbs in these cases seems helpful for wheelchair
users too.

I'm basing this mainly based on this criterium from the
crossing=unmarked documentation:

> By a structural measure the transition should be recognizable. 



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