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

[Clifford Snow]

I don't see any changeset comments in either of the two you referenced. I
would suggest adding a changeset comment to get their attention.

You can also look on their github page to see what they are working on.
https://github.com/Microsoft/Open-Maps/issues

Best,
Clifford

On Wed, Apr 4, 2018 at 5:23 PM, <osm.tagging at thorsten.engler.id.au> wrote:

> Well, the edits seem to be made in JOSM, and the speed seems to be too low
> to be a bot. So I do think they are made by hand.
>
>
>
> But this (and tens of other changesets are all titled "Added turn
> restrictions source: Probe”. I don’t know what “Probe” is, but I assume
> it’s some automated tool somebody wrote to find these supposedly “missing”
> turn restrictions. And now somebody is following the output of that tool to
> enter the turn restrictions into OSM.
>
>
>
> Which really doesn’t make much sense to me, because of some tool is able
> to determine that this isn’t a good place to turn, then router software can
> do the same and doesn’t need explicit turn restrictions in OSM.
>
>
>
> Especially given that (in my understanding) turn restrictions are meant to
> directly reflect a legal turn restriction that is signed “on the ground”
> with either signs or road markings, which these are not.
>
>
>
> Cheers,
>
> Thorsten
>
>
>
> *From:* Jo <winfixit at gmail.com>
> *Sent:* Thursday, 5 April 2018 09:53
> *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?
>
>
>
> That is absurd behaviour. Seems like somebody programmed a bot.
>
>
>
> Polyglot
>
>
>
> 2018-04-05 1:49 GMT+02:00 Tod Fitch <tod at fitchdesign.com>:
>
> 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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-- 
@osm_seattle
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OpenStreetMap: Maps with a human touch
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