Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 762

Geometry Points Label Style: Perpendicular With Tick And Line
3 Click Add.
4 In the Geometry Points dialog box, click
Select the following check boxes:
Tangent-Tangent Intersect
Tangent-Curve Intersect
Curve-Tangent Intersect
5 Click OK to close the Geometry Points and Alignment Label Set dialog
boxes.
6 Press Esc to deselect the alignment.
Alignment with modified label set
750 | Chapter 19 Labels and Tables Tutorials
to clear all check boxes.