[Tagging] no_u_turn restrictions for every entry/exit into a roundabout when the way is split because of physical separation?

[Paul Johnson]

I don't think that's particularly harmful.  I'm not against extending the
criteria to published laws, particularly when those laws are documented in
an official source.

On Wed, Apr 4, 2018, 23:10 <osm.tagging at thorsten.engler.id.au> wrote:

> Actually, it’s not just relatively harmless “noise”. Because such
> no_u_turn restrictions are indistinguishable from e.g. this one:
> https://www.openstreetmap.org/relation/8182004 (which I just created),
> that actually has a sign “on the ground”:
> https://www.google.com.au/maps/@-27.2141567,153.0014115,3a,75y,100.42h,82.68t/data=!3m6!1e1!3m4!1s-vnw60jwbq7XyR_-zZfreg!2e0!7i13312!8i6656
> (excuse the streetview link, don’t have another photo of it right now, but
> I’m driving past it almost every day and am well aware of it).
>
>
>
>
>
>
>
> *From:* Tod Fitch <tod at fitchdesign.com>
> *Sent:* Thursday, 5 April 2018 09:50
> *To:* Tag discussion, strategy and related tools <
> tagging at openstreetmap.org>
> *Subject:* Re: [Tagging] no_u_turn restrictions for every entry/exit into
> a roundabout when the way is split because of physical separation?
>
>
>
> Seems like tagging “noise” to me. I’d expect a router to use the
> roundabout itself because exiting, making a U turn and then re-entering the
> roundabout will be longer and thus slower. Since the no U turn relations
> are there to make routing work and a reasonable router won’t need them, I’d
> say they are “noise”. If I were to go in to fix something on that
> intersection, I’d probably remove the no U turn restriction(s). But I don’t
> think I’d go out of my way to find them.
>
>
>
> Cheers!
>
>
>
> On Apr 4, 2018, at 4:36 PM, osm.tagging at thorsten.engler.id.au wrote:
>
>
>
> I’ve noticed that someone from the Microsoft Open Map team is very busy
> adding turn restrictions all over the place (
> https://www.openstreetmap.org/user/shawat94/ ).
>
>
>
> In my local neighbourhood, I noticed that he added no_u_turn restrictions
> to all the nodes where a road into in/out of a roundabout is splitting
> (because of physical separation). Which basically amounts to 4 no_u_turn
> restrictions for every single roundabout.
>
>
>
> e.g. here:
>
> https://www.openstreetmap.org/changeset/57747093
>
> https://www.openstreetmap.org/changeset/57674063
>
>
>
> There is no actual no_u_turn sign in any of these locations, it’s just
> (mostly) physically a bad idea to attempt a u-turn here.
>
>
>
> Just a few weeks ago I discussed exactly this in #osm and the conclusion
> was that it was neither necessary nor desirable to do this.
>
>
>
> I made a comment about that to the first of the two changesets linked
> above, but haven’t gotten a reply.
>
>
>
> So, what is the general opinion about this here? Should these turn
> restrictions be created or not?
>
>
>
> Cheers,
>
> Thorsten
>
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