Editing a roundabout is a little different to the other junctions.
You can edit the roundabout crown line, as well as the crown lines of any of the connecting roads. You can also edit the width, crossfall and connecting grade of the roundabout circle.
Procedure
Edit Junction: Indicate intersecting road, close to the junction
Edit Roundabout centre circle settings
The road name of the roundabout circle road displays in the Road Name box. The Destination Road Entity, as well as the Road Name, are read-only.
You can edit the Lane width, crossfall and tie-in slope.