2.0

Chapter 4 Working with Cross Sections
344
box. Since this value is for the first station in the station range only, you
probably do not want to edit it here. If you do, then the same value is applied
to the entire station range. To edit the transition values for individual stations,
use the View/Edit Sections command. The Transitions dialog box displays the
left and right transition offset and elevation values.
If you attach a horizontal alignment, then the offset value is listed in the First
Offset edit box, for the right or left side accordingly. A negative offset causes the
transition control point on the template to cross to the opposite side of the
centerline.
If you attach a vertical alignment, then the elevation value is listed in the First
Elevation edit box.
The Transitions dialog box supports up to eight transitions per side. The initial
Transitions dialog box displays the first through fourth transition. Click the
More button to work on the fifth through eighth transitions.
The Subgrade transition elevation box in the Transitions dialog box records the
elevation of the subgrade at the centerline at the specified station. To transition
the subgrade elevation, you can draw a vertical alignment in profile view and
define it as a vertical transition line. Then you can attach this alignment to the
template using the Attach Profiles option of the Edit Design Control command.
5 Select or clear the offset distances and elevations using the check boxes. If you
clear a check box, the transitioning is not applied when the sections are
reprocessed.
6 Edit the values in the edit boxes to the right of each check box.
The offsets and elevations are used to control the points on the template that
you defined as transition points. A negative offset distance value forces that
offset to the opposite side of the centerline in order to force features, such as
medians, across the centerline. These are actual offsets rather than relative.
NOTE
Although you can define transition offsets and elevations through the
Transitions dialog box, the standard method for defining transitions is to
use the Attach Alignments and Attach Profiles dialog boxes that are
accessed from the Design Control dialog box. These boxes assign the offset
distances and elevations graphically based on defined alignments. Then
you can use the Transitions dialog box, accessed through the View/Edit
Sections command, to edit individual sections.
7 Click OK to close the Transitions dialog box.
The sections are reprocessed.
8 Click OK to exit the command when the sections are done processing.
Editing the Template Superelevation Parameters
The first time you access the Edit Design Control command to apply the
template to the cross sections, the Superelevation options are not accessible
until superelevation has been applied to the cross sections with the
Superelevation Parameters command.
Use the Edit Design Control command to modify the parameters for a range of
stations. You can, in a situation where superelevation wasnt required, use the
Superelevation Parameters command to turn on superelevation but set the
method to None for any curves. The Edit Design Control command displays the