[Tagging] Pedestrian and highway crossings of tramways

[Markus]

Hi Vɑdɪm

I don't know the situation in other countries, but in Switzerland,
pedestrian train crossing are signalised (example [1]), while
pedestrian tram crossings usually aren't (example [2]), even if the
tram runs on a reserved track (i.e. separated form the road). Thus i
think it may make sense to use a different tag for pedestrian tram
crossings.

Besides, most pedestrian tram crossing where the tram runs on the road
aren't exclusively pedestrians + trams crossings, but pedestrians +
road traffic + trams crossings, and are already tagged
highway=crossing. I think these tram crossings are best tagged as a
property on the highway=crossing node (and, if mapped, on the
footway=crossing way), e.g. crossing:tram=yes (using the already used
crossing: prefix).

[1]: https://www.mapillary.com/map/im/1AnE8ii19ml0maXTr1Hokw
[2]: https://www.mapillary.com/map/im/WIrjmoDPM8yTP96TfXpY9g

Regards
Markus