Define preferred slopes and crossfalls on the roundel.
Expand Roundel Geometry and click on the Levels & Grades tab.
To ensure that the roundabout is constructed on a tilted plane for drainage, select Has Overall Crossfall. Slopes between crown lines are added to the overall tilted plane slope.
If a tilted plane is specified then enter the Overall Crossfall.
Enter the crossfall in each region of the circulatory area, in all cases a positive fall is downwards and from inner to outer ‘edge’.