kaerast's diary
Double roundaboutsQuick question - how do I map a double mini roundabout, two mini roundabouts which feed into each other with no road in between? At the moment a small road has just been added to separate them, but that's going to be flagged as a road not having a name and therefore an error; it's also not correct.
They're too small to make into proper roundabouts, and you can't have two nodes connected to each other without a way between them.
Incidentally, I spotted they weren't mapped when adding the A99 bus route which embarrassingly goes through an area of Bradford not mapped, the area near my house.
Coordinates:Posted by kaerast at Wed, 11 Mar 2009 13:51:19 +0000 in English (English)
Comment from Edgemaster at Wed, 11 Mar 2009 16:50:01 +0000
Ignore the error, representing it this way is fine. I've had a similar issue, but a barrier is between the two mini-roundabouts http://www.openstreetmap.org/?lat=51.365831&lon=-0.186636&zoom=18&layers=B000FTTT
Comment from chillly at Wed, 11 Mar 2009 21:50:22 +0000
Just draw the roads, with junctions where they should be then mark the junctions as mini roundabouts. This looks like what you have done. The mini roundabouts effectively mark the centre of the junction, their real sizes vary. The fact that there looks like a short road between is a limitation of the representational nature of a map: it is a map not the real world. People, routing s/w and other users of the data will understand perfectly. Eventually we may draw everything as an area rather than simply a line and dots then perfect representation may become a little closer.
Comment from zenfunk at Thu, 12 Mar 2009 10:39:00 +0000
Beeing from germany, we don't have many roundabouts here, the concept of double roundabouts seems wickedly complicated. Why would anybody come up with something like this? Or is there something I don't get? Just curious...
Christian
Comment from 3ld at Thu, 12 Mar 2009 19:45:09 +0000
Hello Christian,
Put your Analyst on stand-by.
Take a look at this junction in Hemel Hempstead in the UK:-
http://www.openstreetmap.org/?lat=51.74584&lon=-0.47302&zoom=17&layers=B000FTF
This set of mini-roundabouts on a big one has been there since the late 1960s. There is also another similar one in High Wycombe, about 30 Kms away, but I have just noticed that it has not been tagged properly (I do not live there anymore so I am not sure whether it is my place to edit it) so I have not referenced it here.
By the way kaerast, I think that the portion of way between the 2 mini-roundabout nodes should be given the name of the main road that these junctions are on.
Mike
Comment from kaerast at Fri, 13 Mar 2009 10:56:20 +0000
3ld - the road changes names between the two mini roundabouts, so the linking road (which doesn't exist) could have either name and still be incorrect. I think Thomas is correct, it doesn't need a name.
Comment from 3ld at Fri, 13 Mar 2009 16:26:58 +0000
kaerast - don't people make life complicated? Sigh.
Comment from zenfunk at Fri, 13 Mar 2009 18:04:27 +0000
@ 3ld:
Thanks for the pic.
In my book, the roundabout in High Wycombe needs you :-).
Just map it, if you got it right, nobody can complain- right?
Cheers, Christian
Comment from LivingWithDragons at Sat, 14 Mar 2009 09:41:42 +0000
This is actually a 'magic roundabout': http://www.openstreetmap.org/?lat=51.467876&lon=-0.423292&zoom=18&layers=B000FTF
There is an island in the middle which you can go round anti-clockwise. Surrounded by lots of mini-roundabouts which you can go round clockwise (you go half way round one to get into the anti-roundabout). If in doubt, you can go clockwise around the edge (technically going round a little bit of each minroundabout), but that would be a long way to take a right turn.
I'd attempt mapping it properly, but I need to survey how many miniroundabouts there are. It might involve taking a photograph, and I should probably be prepared to explain to authorities I'm not a plane-spotter but not a terrorist either (as this is at Heathrow Airport).
