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

[Tod Fitch]

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/ <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/57747093>
> https://www.openstreetmap.org/changeset/57674063 <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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