On Thu, 11 Dec 2008, Ian Sergeant wrote:
> I feel the approach you are taking is wrong.  There are reasonable
> arguments to use a mini-roundabout tag in Australia where it is currently
> being used.  If you want to convince people to not use it, and to map using
> junction, take the time to understand and address those arguments, and
> convince people that the best way is the way you are suggesting.  Don't
> dismiss its proponents as lazy, or worse still as disruptive.  Many of its
> these people have been valuable contributors to getting the map done.
>
> Ian.

I'd like to second Ian's request for more information to be discussed.
Darrin, could you please put up some photographs of the sort of roundabouts 
you are discussing. We may all agree that they are apples in the end.

I have put on the wiki some information culled from wikipedia.
http://wiki.openstreetmap.org/wiki/Roundabouts
The Germans (in a Germanic way) have the definition down to the metre of the 
Mini, small and large roundabout. The Poms are the odd ones out in their 
definition of the mini-roundabout with the curious painted circle on the 
ground.


We should not be making up the definitions of these things for OSM. We should 
be using definitions either from RTA (NSW) or Transport SA or other local 
authority. If they don't exist or can't be revealed to us then the work of 
people who write Wikipedia and have the time knowledge and inclination to 
research these definitions should be a next resource.
If we have access to University Departments of Traffic Engineering; Geographic 
Information Systems or Urban Planning they may also be sources of 
definitions.


I'm pragmatic about the roundabouts.
Does putting 4 nodes on the map with a one way loop improve the usability of 
the map?
Junction=roundabout has been seen mapped onto a single node, and then doesn't 
render in JOSM. It requires at least a few nodes and a way drawn in the 
direction of travel.

I would like to draw the discussion away from the subjective "laziness". This 
immediately draws battle lines and polarises the discussion, so that we can't 
reach any consensus. I have put up sample roundabout photos consistent with 
the Wikipedia English definition, and am happy to view others photos and 
discuss further.

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