[Tagging] Mapping larger Mini-roundabouts

[Pieren]

I missed the point that the miniroundabout would be drawn as a circle
(area). Then why talking about tagging radius/diameter when you have
the information in the geometry ?
I think it is micromapping like drawing normal highways with
rectangles instead of lines. It's experimental and not very popular.
They should use a new set of tags for that and keep the single node
for the compatibility.

Pieren