[Tagging] tagging the diameter of a mini-roundabout

[Peter Neale]

Well, the Highway Code says (Rule 188), "Avoid making U-turns at mini-roundabouts. Beware of others doing this."
I assume that "avoid" is not quite as strong as "prohibited", especially as drivers are then warned to "Beware of others doing thís".
Also, I know of at least one bus route near me that terminates at an (actually fairly large) mini-roundabout, where the busses all do a U-Turn. (https://www.openstreetmap.org/node/1166864821). 
However, I think that the diameter of the centre of a mini-roundabout is irrelevant and even the outer diameter is unlikely to be of use to any map user, unless thay are planning to do a U-Turn (which they are supposed to "avoid" doing.
Regards,Peter(PeterPan99)

    On Thursday, 2 February 2023 at 09:04:05 GMT, 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. Tagging mailing list
 Tagging at openstreetmap.org
 https://lists.openstreetmap.org/listinfo/tagging Tagging mailing list
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