2.0

Table Of Contents
Drawing Vertical Curves for the Finished Ground Centerline
199
The following illustration shows a vertical curve based on the K value:
Drawing a vertical curve by K value
Drawing a Vertical Curve Based on a Passing
Sight Distance
One method of drawing a crest vertical curve is to specify a minimum passing
sight distance.
To draw a vertical curve based on a passing sight distance
1
From the Profiles menu, choose FG Vertical Curves to display the Vertical
Curves dialog box.
NOTE
You can use this option only with a crest curve.
2
In the Description list, select the Passing Sight option. You can also click the
Passing Sight icon, and then click OK.
NOTE
If you do not see the graphic representation of the curve type you want to
create, then click the Next or Previous button at the bottom of the Vertical
Curves dialog box.
3
Select the tangents that represent the grade into and out of the PVI.
4
Enter a value for the minimum passing sight distance.
5
Press ENTER to accept the default values for Height of eye and Height of object,
or enter new values.
The Height of eye is the height of the driverīš’s line of vision coming down the
road; Height of object is the height of a vehicle approaching the driver. The
default values are set in the Profile Value Settings dialog box. The length of the
curve is calculated.
6
Press ENTER to accept the calculated length of curve value, or type a new value.
The passing sight distance is then calculated.