[Tagging] roundabouts without obstacles in the middle

[Colin Smale]

That depends on how the mini-roundabouts are modelled in the route
network, so it's chicken and egg. I mentioned what I would expect, and
you are right, that's not always how it happens now. But if I ask a
fellow human for directions, they will call it a roundabout, as in "turn
left at the roundabout" and not "turn left (at the junction)". 

Junctions (including roundabouts) could be tagged with information for
large/oversize vehicles, like inner radius and outer radius for example,
which might allow a bit of swept path analysis. But that would need to
be based on physical characteristics, and not subjective tags like
whether you think it qualifies as a mini-roundabout or not. 

So I agree that it would be nice to converge the treatment of
mini-/roundabouts and add the tags to describe the centre part. 

//colin 

On 2015-11-04 11:03, Florian Lohoff wrote: 

> On Tue, Nov 03, 2015 at 05:35:53PM +0100, Colin Smale wrote: 
> 
>> Hi Gerd, 
>> 
>> Personally from a navigation point of view I expect roundabouts and
>> mini-roundabouts to be treated the same, i.e. "take the first exit at
> 
> They are currently not - Most navigational software basically does
> not know about mini-roundabouts because they are difficult to
> preprocess (One needs to add ways).
> 
> I'd like mini_roundabouts to disappear and be replaced with
> an additional tag on a roundabout which tells about the existance
> of an obstacle in the middle which makes it one less special case.
> 
> junction=roundabout
> center_obstacle=clear/yes/no/drivable
> roundabout=flat/obstacle
> 
> Whatever ... So processing a roundabout is ALWAYS the same from the 
> navigational perspective and changes only from route selection when
> your vehicle is getting longer.
> 
> Flo 
> 
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