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Chapter 4 Working with Cross Sections
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7 Enter the datum number and press ENTER.
8 Pick the datum points starting from the left connection point out and going to
the right connection point out.
Datum points do not have to be physically attached to the template. They can
exist in space. Use AutoCAD object snaps to pick the datum points accurately.
9 Press ENTER to end the prompt cycle.
Use the Display option to view the defined datum. The datum is only defined
through the template surfaces and not the subassemblies. The subassembly
datum is defined using the Define Subassembly or Edit Subassembly commands.
Subassemblies cannot have multiple datum definitions.
10 Press ENTER to exit the surface control options, and then type SA to save your
changes.
Defining the Template Superelevation Regions
You must define superelevation regions in order to apply superelevation to the
template with the Superelevation Parameters command.
To define the template superelevation regions
1 From the Cross Sections menu, choose Templates ä Edit Template to display
the Template Librarian.
2 Select the name of the template you want to edit.
3 Click OK.
4 Pick an insertion point for the template in the drawing.
The Edit Template command inserts the template using the defined finished
ground reference point as the insertion point. The command draws the
template components and displays the subgrade surfaces and datum line on the
template as highlighted, temporary lines.
When the template is inserted, the following prompt is displayed:
Edsrf/SAve/eXit/ASsembly/Display/SRfcon/Redraw <eXit>:
5 Type SR for Srfcon to activate the Surface Control options.
The following prompt is displayed:
Connect/Datum/Redraw/Super/Topsurf/TRansition/eXit <eXit>:
6 Type S for the Super option.
7 Select the points to define the left and right superelevation regions.
The following prompts are displayed in turn:
Outer left superelevation point:
Inner superelevation reference point:
Outer rollover point:
Outer right superelevation point:
Inner superelevation reference point:
Outer rollover point:
8 Pick the points as you are prompted to do so.
Define the left superelevation region first, followed by the right superelevation
region. When defining the region, pick the outer edge of the region, and then