pkoby
I don't know that it has to be mapped as a roundabout because it isn't one. Left and right sides both go north, so it basically can be considered a bulging crossing of two dual carriageways.

Also in that link is "This tag is only used for road intersections where traffic in the roundabout has right of way in the absence of a traffic signal". This junction is signalized, so it shouldn't have roundabout tags. 