A signal-controlled roundabout reverts to being a normal roundabout if the traffic signals are not working (assuming it is also signed as a roundabout), so the presence/absence of the traffic signals cannot be a criterion for it being a roundabout or not.
I expect most countries will have a traffic sign meaning "roundabout". Apart from anything else they suggest that you should not be surprised or disorientated when you have to turn left while you actually wanted to turn right (left-hand traffic) - keep going round and you will get to your exit. Colin On 2014-06-13 18:25, Volker Schmidt wrote: > 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.treb...@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 [1] >> >> 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 [2] >> >> "Nullius in verba." >> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging [3] > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging [3] Links: ------ [1] http://www.openstreetmap.org/#map=19/52.59689/-1.14146 [2] tel:%2B55%20%2851%29%209962-5409 [3] https://lists.openstreetmap.org/listinfo/tagging
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