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Table Of Contents
Chapter 3 Working with Profiles and Vertical Alignments
220
Changing the Grade Coming Out of the PVI for
the Ditches and Transitions
To edit the grade coming out of the PVI for the ditches and transitions, use the
Change Grade 2 command.
To change the grade coming out of the PVI for the ditches and transitions
1 From the Profiles menu, choose DT Tangents รค Change Grade 2.
2 Select the tangent that represents the grade coming into the PVI.
3 Select the tangent that represents the grade coming out of the PVI. This is the
tangent that will have its grade modified.
The following prompt is displayed:
Grade coming out of PVI:
4 Enter a value for the new grade out in percent, but do not enter the % character.
5 Select another tangent to continue the command, or press ENTER to end
the command.
The command holds the endpoint of the second tangent, as well as the start
point and grade of the first tangent. It applies the new grade to the second
tangent, calculating the new intersection point with the first tangent to
determine the location of the PVI and draws a new tangent based on the grade
you entered. The new second tangent is extended until it intersects with the
grade defined by the first tangent. This intersection is the location of the new
PVI point.
If you use this command after you have added a vertical curve to the PVI, the
command leaves the vertical curve and any labels in their original positions.
Erase the vertical curve, and then recreate it with the Vertical Curve command.
The following illustration shows the new location of a PVI after you change the
grade out:
Changing grade out