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Chapter 3 Working with Profiles and Vertical Alignments
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3 Under K Values, do the following:
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In the Minimum for crest box, type the minimum K value for crest vertical
curves. The K value of a vertical curve is the horizontal distance required to
affect a 1% change in grade on the vertical curve.
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In the Minimum for sag box, type the minimum K value for sag vertical
curves.
NOTE
Vertical curves that do not meet the parameters set in the K value boxes
are flagged in the Vertical Curve Detail Window dialog box by placing a ***
in front of the Min. Length value.
4 Under Sight Distance Values, do the following:
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In the Passing eye height box, type the default passing eye height value. This
is the height of the eye of the driver of the car doing the passing.
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In the Passing object height box, type the default passing object height
value. This is the height of the object being approached when passing
(usually another vehicle).
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In the Stopping eye height box, type the default stopping eye height value.
This is the height of the eye of the driver of the car.
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In the Stopping object height box, type the default stopping object height
value. This is the height of the object being avoided (usually a piece of
debris).
5 Under Label Precision Values, set the label precision values for the existing
ground and finished ground labels. You can type precision values in the boxes,
or you can control the precision by using the slider bars.
6 Click OK.
NOTE
If you need to alter values for a profile that you have already plotted, then
you can use the Profile Properties command, and then reimport the profile.
Sampling Existing Ground Profile Data from
Multiple Surfaces
To create a profile, you must first define and sample the existing ground from a
surface, a file, or from cross sections. When sampling the existing ground data
from surfaces, you have the option to sample one or multiple surfaces at the
same time. To sample multiple surfaces, you must first create a file of the surface
names that you want to sample using the Select Multiple Surfaces command.
Then you must enable the use of multiple surfaces before sampling the data
using the Toggle Multiple Surfaces command.
Selecting a Surface to Sample
To sample profile data from one surface, that surface must be selected as the
current surface. Before you sample the existing ground profile, use the Set
Current Surface command to select the current surface.