https://wiki.openstreetmap.org/wiki/Tag:junction%3Droundabout says

> The tag junction <https://wiki.openstreetmap.org/wiki/Key:junction>=
> roundabout is *used only on road intersections where traffic on
> the roundabout <https://en.wikipedia.org/wiki/Roundabout> has right of way*
> .
> That is, the roundabout itself should be free from all intersection
> controls including traffic signals, stop signs or stop markings, give-way
> (or yield) signs or give-way markings. However there exists exceptions in
> some roundabouts in some cases where there's a special service way passing
> through the island, reserved to buses/tramways/emergency vehicles (which
> will have priority to the normal traffic, and for which there may be
> traffic signs requiring vehicles on the ring to give the way; in normal
> times these giveways and traffic signals are off).
> Where traffic does not have right of way, this is a rotary
> <https://en.wikipedia.org/wiki/Traffic_circle> (also called traffic
> circle). The tag junction
> <https://wiki.openstreetmap.org/wiki/Key:junction>=circular
> <https://wiki.openstreetmap.org/wiki/Tag:junction%3Dcircular> should be
> used on rotaries


In the Netherlands, all roundabouts are tagged junction=roundabout, even
though without any controls traffic on the roundabout would legally have to
give way to traffic coming from the right, entering the roundabout.

I'm not vary confident that mappers would want to change the mapping just
because the traffic code has changed somewhere in the past. Nobody here
knows the word rotary for a roundabout. In practice, all roundabouts have
traffic controls. Small ones just have shark's teeth, that's a legal
priority control.
I move to make this this restriction less strict: if there is traffic
control by static signs or markings, it's also a junction=roundabout. This
is visibly verifiable by any mapper, and would retain the requirement of
priority for traffic on the roundabout over traffic entering the
roundabout.

Fr gr Peter Elderson

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