how to Superelevation Axis of Rotation in civil 3d

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The Superelevation Axis of Rotation in Civil 3D determines the pivot point for the roadway cross-slope during superelevation transitions. This is essential for designing roadways where the lanes tilt to accommodate curves. By setting the axis of rotation, you control how the road cross-section adjusts during superelevation.
Here’s a step-by-step guide to managing the Superelevation Axis of Rotation in Civil 3D:
1. Open the Superelevation View
Select the alignment in your drawing.
On the ribbon, go to the Alignment tab.
In the Design panel, click Edit Superelevation to open the Superelevation View.
2. Access Superelevation Options
In the Superelevation Editor, ensure your alignment has superelevation data applied. If not, you’ll need to calculate superelevation first:
Click Calculate Superelevation and follow the wizard to define parameters like design speed, curve radii, and lane widths.
Once superelevation is applied, lanes and transition details will appear in the Superelevation View.
3. Set the Axis of Rotation
The axis of rotation determines where the road pivots during superelevation (e.g., centerline, edge of pavement, etc.).
To set the axis of rotation:
Select the corridor assembly associated with your alignment (or create a new one if necessary).
Open the Assembly Properties:
Right-click the assembly and select Properties.
In the Assembly Properties dialog box, go to the Superelevation tab.
Under Axis of Rotation, choose one of the following options:
Centerline: The road pivots around the centerline.
Left Edge of Pavement: The road tilts around the left edge.
Right Edge of Pavement: The road tilts around the right edge.
Custom Location: Specify a specific offset from the centerline.
4. Update Corridor Properties
Open the Corridor Properties for the corridor associated with the alignment.
Go to the Parameters tab and ensure the superelevation settings are linked to the assembly.
Rebuild the corridor to apply the changes.
5. Verify the Axis of Rotation
Use the Section Editor to check how the superelevation is applied:
Select the corridor, right-click, and choose Section Editor.
Navigate through stations to see how the roadway tilts based on the axis of rotation.
Make adjustments as needed by returning to the assembly or superelevation parameters.
6. Adjust the Superelevation Transition (Optional)
In the Superelevation View, fine-tune the transition regions:
Modify the tangents or curves to adjust the length and slope of transitions.
Use grips or manually edit values to meet design requirements.
Tips:
Dynamic Updates: Enable Automatic Rebuild for real-time updates when you make changes to the axis of rotation or superelevation values.
Check Standards: Ensure the chosen axis of rotation complies with local design standards or project requirements.
Visual Verification: Use the 3D view to visually inspect the roadway’s tilting behavior along curves.