[Tagging] tagging the diameter of a mini-roundabout

[Volker Schmidt]

Yes, Phil, I overlooked your last point (and I have UK driving license).
In Italy there are no separate rules or road signs for traversable
roundabouts, hence no interdiction of U-turns. That needs addressing.
Country-specific defaults?

"My" traversable roundabout is in fact often used for U-turns, but only by
shorter vehicles. The articulated trucks I observe, are turning left, not
U-turning, on a four-way layout.



On Thu, 2 Feb 2023, 10:04 Philip Barnes, <phil at trigpoint.me.uk> wrote:

> A mini roundabout often doesn't usually have a diameter. Most are jus
> normal junctions which have been made mini-roundabouts to set a priority.
>
> So in terms of large vehicles it is the same problem as any other
> junctions, whether they can turn left or right.
>
> In the UK, U turns are prohibited at mini-roundabouts, which I would have
> thought would be the main usecase for a diameter.
>
> Phil (trigpoint)
>
> On 2 February 2023 03:31:39 GMT, Matija Nalis <
> mnalis-openstreetmaplist at voyager.hr> wrote:
>>
>> If the actual issue is that HGV cannot pass some road, why not simply mark it as
>> `hgv=no`? Besides being simple, it has the additional advantage that routers
>> will actually already use it and direct HGVs somewhere where they can actually
>> pass.
>>
>> Or if some lenghts of HGVs can pass, but others not, then maxlength=*
>> or maxlength:hgv=* or some of the other alternatives from
>> https://wiki.openstreetmap.org/wiki/Key:maxlength ?
>>
>> On Wed, 25 Jan 2023 21:25:32 +0100, Volker Schmidt <voschix at gmail.com> wrote:
>>
>>>  I see that I was not precise with my question: I am after a way to tag the
>>>  overall diameter of the round surface composed of the mini-roundabout road
>>>  surface plus the traversable central part. This is an important measure for
>>>  trucks. I happen to live near one of these with an outer diameter of 12 m,
>>>  and that attracts regularly articulated lorries like the cheese attracts
>>>  flies. This triggered the question.
>>>
>>>  Il giorno mer 25 gen 2023 alle ore 19:10 Peter Neale via Tagging <
>>>  tagging at openstreetmap.org> ha scritto:
>>>
>>>  According to the Wiki (with which I happen to agree), a mini-roundabout is
>>>>  defined as:
>>>>
>>>>  "...a special type of roundabout in which the middle can be traversed
>>>>  <https://wiki.openstreetmap.org/wiki/Traversable> by vehicles, and is
>>>>  typically used where there is only limited space available. Road traffic
>>>>  flows in one direction around a point in the middle and the traffic in the
>>>>  roundabout has right-of-way. The middle of a mini-roundabout is usually
>>>>  only a painted circle, but there might also be a low, fully traversable
>>>>  (mountable) dome or island."
>>>>
>>>>  As it is traversable, does it really have a diameter?  Or, if there is a
>>>>  painted circle (are traversable domed area) on the ground, perhaps that has
>>>>  a diameter, but does it matter to any prospective map user?
>>>>
>>>>  Regards,
>>>>  Peter
>>>>
>>>>  Peter Neale
>>>>  t: 01908 309666
>>>>  m: 07968 341930
>>>>
>>>>
>>>>  On Wednesday, 25 January 2023 at 17:53:55 GMT, Volker Schmidt <
>>>>  voschix at gmail.com> wrote:
>>>>
>>>>
>>>>  Is there an established way to tag the diameter of a mini-roundabout?
>>>>
>>>>  We have the tag diameter, but I could not find it applied to
>>>>  mini-roundabouts.
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>>
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