Expand Arm Geometry and click on the Levels & Grades tab.
The Grade at Blend Point (longitudinal) would normally be taken from the existing road surface. However, if the roundabout design requires that the existing surface levels at the blend point change, you may define a default gradient and limiting values which Roundabouts will use in its design checks.
In all cases the Max and Min values represent the limiting values from the adopted design standard and the Default value will be used when the roundabout is first placed. A default value MUST be provided but Max and Min may be blank if there is no limiting value.