[Tagging] 2 meaning for crossing=zebra

[SelfishSeahorse]

On Fri, 26 Oct 2018 at 12:46, Tom Pfeifer <t.pfeifer at computer.org> wrote:
>
> Why should we invent a new subtagging scheme when we already have one with crossing=* + crossing_ref=* ?

Because there are countries where pedestrian crossings with traffic
signals also have zebra markings and it's not obvious that
crossing=zebra excludes crossings with traffic signals (they are even
called zebra crossings too). Therefore these crossings often get
wrongly tagged crossing=zebra.

Besides, the meaning of crossing=uncontrolled is even less clear.

> On Fri, 26 Oct 2018 at 01:19, Bryan Housel <bhousel at gmail.com> wrote:
>  > - `crossing=unmarked` which is labeled “Unmarked Crossing”
>
> Tagging "unmarked crossings" does not make sense for me. An unmarked crossing is defined in OSM by a
> road and a footway sharing a node, there is no need for a tag here, as there is nothing special.

The absence of a highway=crossing (and a crossing=*) tag on a node
shared by a road and a footway doesn't mean that there is an unmarked
crossing, it could also mean that the footway continues on the
sidewalk or that the pedestrian crossing hasn't been mapped yet.

Regards

Markus