[Tagging] Signal-controlled roundabouts

[Volker Schmidt]

Good question.

I think this is because originally it was, as many others in the UK, a true
roundabout with priority in the ring. The traffic signals were added later
to avoid blocking up the (ex-)roundabouts. I have seen many roundabouts in
the UK go through these phases: New "clean" roundabout; access control by
traffic signals (sometimes part-time); traffic signals in the actual ring
(as in the example.
Even though they are still called xxx-roundabout, I agree with you that
they do not correspond to the criteria for roundabouts, and I believe there
are no roundabout traffic signs either
I would invite comments form the UK mappers on this, as they seem to have
added the corresponding paragraph into the wiki article on roundabouts.
Here in Italy I would not tag a similar road layout as junction=roundabout


On 13 June 2014 17:54, Fernando Trebien <fernando.trebien at gmail.com> wrote:

> Hello,
>
> I used to believe that, by definition, all roundabouts have free
> transit and right of way along the circle, and that anything that
> didn't display that property isn't a roundabout (just a circle). But
> reading the wiki once again, I'm a little in doubt. The wiki mentions
> that this is a roundabout, but I would previously have thought it
> wasn't because of the traffic lights within it:
> http://www.openstreetmap.org/#map=19/52.59689/-1.14146
>
> So why is it a roundabout? Is it because of the circular shape? Or
> could it be because it's impossible to infer that any of the entering
> ways have right of way, since they are all controlled by traffic
> lights?
>
> --
> Fernando Trebien
> +55 (51) 9962-5409
>
> "Nullius in verba."
>
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