[talk-au] What gives with roundabouts?

Liz edodd at billiau.net
Wed Dec 17 10:02:44 GMT 2008


On Mon, 15 Dec 2008, Ian Sergeant wrote:
> The primary questions here is:
>
> <Should a suburban roundabout be mapped as a node or as a loop?>
>
> My position is a node for three reasons..
or something like a josm plugin which would turn a node into a little way with 
4 nodes, on demand?

>
> + When you cross this kind of roundabout when cycling, or with a learner
> driver, you don't have to worry about the characteristics of the road you
> are crossing (since you never turn into the traffic of the cross road, you
> just cross the roundabout).  This isn't just about cyclists and learners.
> Its about the nature of the intersection.

a roundabout has different road rules
and you certainly don't cross the roundabout unless you are driving a big 
truck with flashing red and blue lights

>
> + It represents what is on the ground accurately.  Often there is less of
> an actual diversion than many other traffic calming devices, which are not
> mapped.  To draw it as a deviation in the road, just isn't what is there.

A deviation is part of the design philosophy of a roundabout

>
> + These have a very standardised appearance, and should be represented in a
> standardised way, like a template.  The benefit isn't just in time-saving,
> but in identifying that all these roundabouts are very much the same.

a plugin?

>
> Once this is decided there are other questions to answer...
>
> <Is it reasonable to overload (reuse) a tag (mini-roundabout) originally
> designed to represent something else overseas, that doesn't exist in
> Australia?>
>
> <How to define this kind of roundabout?>
>
> <If we need a new tag, what should that tag be?>
>
> Many of the points in this argument aren't being made against having some
> types of roundabouts mapped as a node, but rather are arguments against
> overloading tags that mean something else outside of Australia.
>
> Other arguments are saying that the current definition is poor.
>
> I can agree with these arguments, to a certain extent.  (Although I think
> people arguing against overloading tags have a bigger campaign on their
> hands than just mini-roundabouts.)  However, before we can get to them, we
> need to decide if this kind of roundabout is best represented by a node, or
> a loop.  Then progress to what, if anything, the tag should be.
>
> Ian.
>
>
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