[OSM-talk] Roundabouts - why is a separate segment required?

[Dave F]

> If I'm judging the angles correctly, OsmAnd will not even announce that
> intersection: the angle between Wapping and Commercial is shallow
> enough that OsmAnd sees it as a single road, while the angle between
> Wapping and the roundabout is sharp enough to not require a "keep
> left" instruction.

If true I see that as a worrying error in OSMAnd. Entering form Wapping 
you pass roundabout signs approach give way markings for traffic on the 
roundabout. It's scary routers base their calculations on geometry 
rather than tags & node locations.

> the router now needs to check all ways
> connected to that node to see if any of them is part of a roundabout.

No different from when you encounter an exit, even if it's not attached 
to the same node as an entrance.

DaveF