[OSM-talk-nl] junction= roundabaout

Thu Nov 22 11:44:11 UTC 2012

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" <mdeen at 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 at openstreetmap.org
> http://lists.openstreetmap.**org/listinfo/talk-nl<http://lists.openstreetmap.org/listinfo/talk-nl>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-nl/attachments/20121122/70e9fe8f/attachment.htm>