We were talking about roundabouts that were split in their composing ways, nothing is impeding routing over a split roundabout, but the graph of the routes is not as nice/clear/unambiguous when the roundabouts are not split.
Polyglot 2012/11/22 Hugo Hölscher <hugoholsc...@gmail.com> > Agree more the exeption then the rule. But any action which prohibits > routing for this situation should be avoided, > Hugo > Op 22 nov. 2012 12:48 schreef "Jo" <winfi...@gmail.com> het volgende: > > In that case you add all the ways of the roundabout to your route >> relation. You'll have to admit it's rather the exception than the rule. >> >> Jo >> >> >> 2012/11/22 Hugo Hölscher <hugoholsc...@gmail.com> >> >>> I do think there are situations were you want do a full roundabout. >>> Example: want toturn left on a road, but that is prohibited. Right is >>> allowed and there is a nearby roundabout. Then you will do a full-turn. >>> Hugo >>> Op 22 nov. 2012 10:03 schreef "Maarten Deen" <md...@xs4all.nl> het >>> volgende: >>> >>> On 2012-11-22 09:41, Wolfgang Wienke wrote: >>>> >>>>> Am 22.11.2012 07:50, schrieb Maarten Deen: >>>>> >>>>>> On 2012-11-21 20:48, Wolfgang Wienke wrote: >>>>>> >>>>>>> Am 21.11.2012 18:48, schrieb Maarten Deen: >>>>>>> >>>>>>>> On 11/21/2012 06:45 PM, Maarten Deen wrote: >>>>>>>> >>>>>>>>> On 11/21/2012 06:41 PM, Wolfgang Wienke wrote: >>>>>>>>> > Hi, >>>>>>>>> > I'm mapping in NL near Aachen. Can someone tell me, why there is >>>>>>>>> more >>>>>>>>> > that ONE way in a dutch roundabaout? >>>>>>>>> There isn't. A roundabout is always one way. If there are two >>>>>>>>> directions >>>>>>>>> it is not a roundabout but a circular road. >>>>>>>>> >>>>>>>>> Just after sending this I realized that I must have misread your >>>>>>>> question. You mean why most roundabouts are made up of more than one >>>>>>>> way. >>>>>>>> >>>>>>>> Initially it is because of the AND import. The AND dataset was such >>>>>>>> that >>>>>>>> between every junction of 3 or more roads there was a sperate way. >>>>>>>> >>>>>>> What means the AND dataset? >>>>>>> >>>>>> >>>>>> AND donated their dataset in 2007 and was subsequently integraded >>>>>> into OSM. >>>>>> <http://wiki.openstreetmap.**org/wiki/AND_Data<http://wiki.openstreetmap.org/wiki/AND_Data> >>>>>> > >>>>>> >>>>> I do not find there any special about roundabouts. I think, that it >>>>> is important to recognize a roundabout for navys to tell the user >>>>> something like "leave the rounabout at the second street". >>>>> Is there no discussion in Netherlands to join the automatically >>>>> generated part of a roundabout manually? >>>>> >>>> >>>> No, because that is not necessary. >>>> The AND data was structured such that at every point where there is a >>>> juntion of three or more ways, a new way was created. You'll still see that >>>> in lots of parts of the Netherlands: >>>> <http://www.openstreetmap.org/**?lat=51.319581&lon=5.996067&** >>>> zoom=18&layers=M<http://www.openstreetmap.org/?lat=51.319581&lon=5.996067&zoom=18&layers=M> >>>> > >>>> >>>> It is not necessary that the road "Lindanusstraat" is split up in 5 >>>> parts, but that is how the AND dataset came. You'll notice the AND_nosr_r >>>> tags on these ways, so you can see it came from AND that way. The same with >>>> roundabouts. Because every connecting road is a point where 3 ways connect, >>>> it was a different way. >>>> >>>> Routing engines have no adverse effects from this. There is no >>>> (sell-respecting) routing engine that will tell you to "continue for 100 >>>> metres" a thousand times when the road is spilt up in smaller ways. So why >>>> would it do that on a roundabout? >>>> A roundabout is recognized by its tag: junction=roundabout. Not by its >>>> physical properties (a circular one-way street). >>>> >>>> Now it is just convenient if you have different relations (like a bus >>>>>>>> line) over the roundabout. Then you can indicate exactly which side >>>>>>>> a >>>>>>>> relation takes. >>>>>>>> >>>>>>> Well, this is really not necessary because you drive the roundabout >>>>>>> alwas in the same direction. >>>>>>> In Germany we only have roundabouts made of ONE way. If you use the >>>>>>> relation-editor of JOSM, than you can easily recgnize a roundabout. >>>>>>> Would it not be easier, to use only ONE way in a roundabaout? >>>>>>> >>>>>> >>>>>> I think this looks much tidier than when roundabouts are always one >>>>>> way. >>>>>> >>>>>> >>>>>> <http://www.openstreetmap.org/**?lat=51.32506&lon=5.97571&** >>>>>> zoom=17&layers=T<http://www.openstreetmap.org/?lat=51.32506&lon=5.97571&zoom=17&layers=T> >>>>>> > >>>>>> >>>>>> Also, if you make a route over a roundabout, you never use the full >>>>>> roundabout, so why would you want the full roundabout in the relation? >>>>>> >>>>> >>>>> Of course this is true, but I think it looks tidier the other way, >>>>> look here. You see at once, that there is a roundabout. >>>>> >>>>> http://www.openstreetmap.org/?**lat=50.791022&lon=6.059449&** >>>>> zoom=18&layers=T<http://www.openstreetmap.org/?lat=50.791022&lon=6.059449&zoom=18&layers=T> >>>>> >>>> >>>> I don't see the difference there because it has only single ways >>>> connecting to the roundabout. >>>> >>>> But let me ask this simple question: if you go from A to B via a >>>> roundabout, do you traverse the whole roundabout or only a part of it? Why >>>> then add the full roundabout to a relation that describes the route from A >>>> to B? >>>> >>>> It is also clearer not to add the full roundabout. Take this example: < >>>> http://www.openstreetmap.org/**?lat=51.333905&lon=5.995042&** >>>> zoom=18&layers=T<http://www.openstreetmap.org/?lat=51.333905&lon=5.995042&zoom=18&layers=T> >>>> > >>>> >>>> It is immediately clear that bus 62 goes from east to west. If you had >>>> the complete roundabout in the relation, the whole roundabout would be red >>>> and you would not know which direction the relation had. >>>> >>>> Regards, >>>> Maarten >>>> >>>> >>>> ______________________________**_________________ >>>> Talk-nl mailing list >>>> Talk-nl@openstreetmap.org >>>> http://lists.openstreetmap.**org/listinfo/talk-nl<http://lists.openstreetmap.org/listinfo/talk-nl> >>>> >>> >>> _______________________________________________ >>> Talk-nl mailing list >>> Talk-nl@openstreetmap.org >>> http://lists.openstreetmap.org/listinfo/talk-nl >>> >>> >> >> _______________________________________________ >> Talk-nl mailing list >> Talk-nl@openstreetmap.org >> http://lists.openstreetmap.org/listinfo/talk-nl >> >>
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