mihaiserban's Diary

OSM Xml scripting

Posted by mihaiserban on 12 April 2010 in English.

Hi everybody. Here's a list of roundabouts without the one way tag, if anybody wishes to edit them please don't hesitate :D

OSM Roundabouts without oneway tag. ** romania.xml **

Discussion

Comment from tomevans on 12 April 2010 at 12:42

Erm, the wiki page says:

"The segments in the way must go around the roundabout in the direction the traffic flows, but there is no need to tag them as oneway=*. "

And:

"Implies

* oneway=yes "

Seems fairly sensible to me - roundabouts normally work like that, so why tag it twice?

Or have a misunderstood what you were saying?

Comment from Pieren on 12 April 2010 at 13:02

I confirm in other words : do you know roundabouts which are not oneways ? or if they are oneways, are they really roundabout ?

roundabouts are at the end the only elements where oneway IS implied, otherwise it is not a roundabout. Other elements where oneway could be implied by default like motorway, motorway_link are disputed on the wiki since years.

Basically, you should report the roundabouts where the circle direction is incorrect.

Comment from mihaiserban on 12 April 2010 at 13:04

sorry, roundabouts missing the tag "oneway=yes"
I have made this script because i've been working with routing for OSM maps, mostly with cloudmade. If a roundabout is missing the "oneway=yes" then it will route you wrong through the roundabout.
Roundabouts should only have one direction, so it's not a mistake. :)

Comment from mihaiserban on 12 April 2010 at 13:10

hmm you're right, the "oneway=yes" is a quickfix for roundabouts made out of a single way, which aren't composed of ways to represent direction the traffic flows.
but it's way easier then editing all thoose ways :)

Comment from mihaiserban on 12 April 2010 at 13:15

Closing this, seems that cloudmade fixed this on their side, if they get a roundabout tag it automaticlly implies it's oneway.
So you're right tomevans, no need for oneway tag. :)

Comment from Ciprian on 12 April 2010 at 13:17

Well, I have to agree with Pieren and tomevans: the oneway tag is implied in the case of roundabouts. If you have problems with routing you should do the following steps:
1. Check that the roundabout direction is correct in OSM data, otherwise reverse it. If the direction is fine then move to step 2 :), otherwise stop and way for Cloudmade to update the data.
2. Report this as a bug to Cloudmade, because in this case their routing engine is not working properly.

Note: To be honest I am using Cloudmade's routing on my site and I haven't seen this problem so I recommend checking the data.

Comment from c2r on 12 April 2010 at 17:03

Sorry if I'm being thick, but where roundabouts are made up of more than one way (e.g. where there are bridges over roads), how would a routing programme know whether to turn left or right into the roundabout (given not all countries drive clockwise or anticlockwise).

Ta
Chris

Comment from Lipperlandexpress on 12 April 2010 at 17:26

>how would a routing programme know whether to turn left or right into the roundabout

Use the direction of the way ?
junction=roundabout means that you can only drive in the mapped direction.

And for mihaiserban:
We never tag for the renderer or routers. They must be fixed and not the data.
I remove every additional oneway=yes Tags in roundabouts that I see.

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