And then do I have to bisect the existing roads and rejoin them to the circle somehow? Why can't I just change an intersection into a roundabout, perhaps with

And then do I have to bisect the existing roads and rejoin them to the circle somehow? Why can't I just change an intersection into a roundabout, perhaps with a slider to select the diameter? Surely from a metadata point of view it makes more sense to store the describable facts rather than a bunch of road segments that emulate a circle.