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Table Of Contents
Chapter 4 Working with Cross Sections
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4 Under Transition In and Transition Out, enter the following values:
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Runout: Enter the Transition In and Transition Out runout distance in the
respective edit boxes.
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Runoff: Enter the Transition In and Transition Out runoff distance in the
respective edit boxes.The runoff value controls the distance it takes to
transition from the maximum superelevation grade of one curve to the
maximum superelevation grade of a second curve. If the maximum
superelevation grade for both curves are the same, then 0 can be entered for
the runoff distance because no transition is required.
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% runoff: Enter the percentage of runoff for the curve in this edit box. The
percentage of runoff is the amount of runoff length that occurs before the
actual curve is encountered.
5 Choose a Subgrade Superelevation Method from the list. Form more
information, see Methods for Superelevating the Subgrade in this chapter.
6 Under Transition In and Transition Out, enter a distance. These distances
control what distance it takes for the subgrade surface to adjust to a grade where
it is parallel to the superelevation region. This Transition In distance is applied
before the start of the runout and the Transition Out is applied after the end of
the runout.
7 Click OK to accept the edits you made in the Superelevation Curve Settings
dialog box.
8 Click OK to close the Superelevation Control dialog box.
9 Click Yes to save your changes.
The following illustration shows superelevation parameters:
Superelevation parameters
Methods for Superelevating the Subgrade
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None: When this option is selected, the subgrade is not superelevated.
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Parallel: When this option is selected, the subgrade surface superelevates
parallel to the superelevation region of the template for the entire width of
the subgrade, from the center to its outer edge.
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Fixed Break: When this option is selected, the subgrade below the template
superelevation region superelevates parallel to the superelevation region, and
the subgrade outside of the superelevation region does not superelevate.
When you define template superelevation regions, you can use the subgrade
break point offset modifier option to set the location of this break point in
relation to the outer superelevation region point. If the default of 0.00 is