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 can define a default gradient and limiting values which Roundabouts will use in its design checks.
Vertical Transition Arc is a user defined arc of given radius where one end of which is tangential to the incoming road.
The Entry Side Cross Slope calculates the entry cross slope from the crownline of the road to the kerb and is used to calculate the level of the outside kerb, between the blend point and the change in transition.
The Deviation Offset From ICD sets the offset of the cross slope from the ICD location.
The Crown Line Offset at Entry sets an offset for the entry crown line as a percentage.
The Exit side Cross Slope calculates the exit cross slope from the crownline of the road to the kerb and is used to calculate the level of the outside kerb, between the blend point and the change in transition.
The Deviation Offset From ICD sets the offset of the cross slope from the ICD location.
Crown Line Offset at Exit sets an offset for the exit crown line as a percentage.
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.