[Routing] Roundabouts - why is a separate segment required?

[Dave F]

Hi
Could anyone give me an explanation for this line from 
https://wiki.openstreetmap.org/wiki/Tag:junction=roundabout

"Each road has to be connected with the roundabout in a separate 
node—that is, between these nodes a segment of the roundabout is required."

I see no requirement for a separate segment:

  * When a entering road shares a node with a roundabout then the router
    knows it's entered that roundabout by reading the tags on the
    circular way.
  * Whilst on that node, the router checks to see if there are any
    suitable exits. If there are, then it leaves the roundabout.
  * If not, it continues going around until it finds an appropriate exit.

Cheers
DaveF


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