2.0

Chapter 3 Working with Profiles and Vertical Alignments
218
Drawing the Vertical Alignment Tangents for the
Ditches and Transitions
To draw the vertical alignment tangents for the ditches and transitions
1 Use the Set Current Layer command to set the current layer to the
appropriate layer.
2 From the Profiles menu, choose DT Tangents ä Create Tangents.
3 Select the starting point using one of the following methods:
n
Select a point from the drawing. You are prompted for the station and
elevation. The default station is the station of the point selected. The default
elevation is the elevation of the point selected.
n
Type S to select a station. You are prompted for the station and elevation.
The default for the station is the starting station of the profile; the default
elevation is the elevation of the existing ground at the station entered.
4 Enter a station and elevation for the starting point of the tangent, or press
ENTER to accept both default values.
5 Select a point to end the tangent using one of the following methods:
n
Pick a point from the drawing.
n
Type L to specify a length. The command prompts you to select a grade,
elevation, or point to define the elevation of the endpoint of the tangent.
n
Type S to enter a station. The command prompts you to select a grade,
elevation, or point to define the elevation of the endpoint of the tangent.
NOTE
Type
U
to erase the previous line drawn and revert to the previous station
and elevation entered. Type
X
to exit the command.
After displaying the station, elevation, and last grade of the current point, the
command prompts for another length, station, or point.
6 Press ENTER to end the command.
The following illustration shows some of the parameters used in creating
vertical alignment tangents:
Parameters in vertical alignment tangents