[Talk-nz] Turn restrictions rabbithole

[Kiel Hurley]

If you do remove any turn restrictions using iD, please use the Turn
Restrictions widget rather than deleting the turn restriction relation from
the node.
I've noticed if the relation is deleted from the node, the relation still
exists but without a "via", which causes an error (but doesn't appear to be
shown as one in iD).

JOSM is able to detect them as errors, and from there the no-longer-needed
relations can be deleted.

On Tue, 4 Aug 2020 at 10:38, Eliot Blennerhassett <
eliot at blennerhassett.gen.nz> wrote:

> Now I've seen these restrictions visualizers...
>
>
> https://ahorn.lima-city.de/tr/?zoom=18&lat=-43.553894&lon=172.635211&layer=Grayscale&overlays=TTT
>
> https://restrictions.morbz.de/#17/-43.55386/172.63474
>
> I'm seeing a huge proliferation of labelling every way of a junction
> with what I call a "Self No U-turn" i.e. the from and to members are the
> same segment.
>
> See for example this area:
>
>
> https://ahorn.lima-city.de/tr/?zoom=18&lat=-43.553894&lon=172.635211&layer=Grayscale&overlays=TTT
>
> https://restrictions.morbz.de/#17/-43.55386/172.63474
>
> If you look at
> https://wiki.openstreetmap.org/wiki/Relation:restriction#Tags, it says
> "*to add a no_u_turn restriction relation seems only useful if
> from-member and to-member are different way objects"
>
> So I think all these no-U that I'm seeing are useless, and in some cases
> actually erroneous e.g. when the T junction is between a driveway and a
> road it is not prohibited to do a U turn on the road.  And they make it
> harder to review actual turn restrictions.
>
>
> I've deleted a bunch, but I'm interested if anyone else has any opinion
> on this.
>
>
> No-U-turn where the From and To members are different ways is of course
> still valid e.g.
> https://www.openstreetmap.org/relation/9027919
> https://www.openstreetmap.org/relation/5391722
>
> --
> Eliot
>
>
>
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