[Tagging] Often seen tagging problems regarding junctions

[Richard Mann]

I use highway=footway+crossing=X+crossing_ref=Y on *ways* (as well as
placing a wiki-compliant node at the intersection of the crossing way and
the road way).

This makes it (relatively) easy to draw a Zebra crossing, correctly
orientated along the way.

Richard

On Sun, Nov 1, 2015 at 10:05 AM, Gerd Petermann <
GPetermann_muenchen at hotmail.com> wrote:

> Hi all,
>
>
> while trying to clean up wrong highway=* tags in the OSM database
>
> I noticed a few error patterns. Not sure if I can call it an error when
>
> other people are using tags in a completely different way, but I think
>
> I should report them:
>
>
> 1) the tag highway=crossing is/was used for ways, often instead of
>
> bridge=yes, often at junctions instead of footway=crossing or
> cycleway=crossing
>
> or in addition to them.
>
> I think it happened in the past, so this seem no longer a problem.
>
>
> 2) Some mappers tag a footway that is crossing the road like this:
>
> -  the way:
>
> highway=footway
>
> - the first and last node of the way (both on the sidewalk):
>
> highway=crossing[,crossing=*][,crossing_ref=*]
>
> The advantage of this tagging is that e.g. JOSM shows the
>
> symbol for crossing=traffic_signals at the position where
>
> one would expect the traffic_signal (and maybe the button)
>
>
> 3) nodes with tags like highway=traffic_signals;crossing or
>
> highway=crossing;traffic_signals show that it is not very clear
>
> how to use these tags, I am not even sure if some of the combinations
>
> that Taginfo shows are valid, e.g.
> highway=motorway_junction;traffic_signals
>
>
> The wiki http://wiki.openstreetmap.org/wiki/Tag:highway%3Dtraffic_signals
>
> explains how to tag junctions with highway=traffic_signals,
>
> the wiki http://wiki.openstreetmap.org/wiki/Key:crossing
>
> explains the crossing=* tag. What I am missing is a combination of both.
>
> Should I tag crossing=traffic_signals at a junction that has one or more
> nodes
>
> with highway=traffic_signals? Or should I use crossing=controlled instead?
>
> Is a crossing_ref=zebra correct when the junction is controlled by
> traffic_signals?
>
> Should I map highway=stop at a junction with highway=traffic_signals?
>
>
> My understanding is this:
>
> - For the routers, we like to have the information that the junction is
> controlled by
>
> traffic_signals, as this means a potential delay. For routing, we don't
> want to have
>
> several different nodes with highway=crossing or highway=stop ,
> highway=traffic_signals
>
> etc. for a single junction, as it is difficult to sort out which one adds
> more delay.
>
> - For renderers or "completeness" we like to have the position of each
> traffic_sign, each traffic_signal
>
> and each crossing=zebra.
>
>
> If I got that right, a few proposals were made to solve this conflict,
> e.g. relations
>
> or closed ways to collect all elements of one junctions, but none seems to
> be
>
> used often.
>
>
> If anybody thinks that there is a good and correct solution for a complex
> junction in OSM, please
>
> post a link.
>
>
> ciao,
>
> Gerd
>
>
>
>
>
>
> _______________________________________________
> Tagging mailing list
> Tagging at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/tagging
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20151101/81eb6bed/attachment.html>