This is a horizontal tranistioning example with multiple alignments.
If you haven't installed the Section3D subassembly click on the button below to view How to Install Section3D Subassembly:



RoadTransitions-Completed.dwg : Sample Civil 3D 2010 Dwg File used for this tutorial
RoadTransitions-Templates.zip : Section3D Templates (fully reusable and modifiable) created in this this tutorial

This is a typical reconstruction cross-section where the road widening starts from the existing edge of pavement, and therefore the width of widening varies slightly in every section. This example assumes that L2 and R2 to be the transitioning alignments for the left and right edge of pavement.



If you study the cross-section there can be a total of 12 transitions (6 on each side).



In this example the transitioning alignments were sketched for the purpose of excercise.



Again, for the sake of simplicity and excercise the alignment names were conveniently chosen with either L(eft) or R(ight).



Note that the alignment is projected to the main(ground) surface by default when there is no profile, but the centerline alignment with the design profile is drawn with the correct elevation at each station.



You can select a different marker for the default point if you want.



The following Section3D code was quickly prepared to define the left side of the road, but you may be able to come up with a better solution. A good solution is usually the one which is organized and easy to follow with the minimum points and links. This code may not flexible for future reuse/modifications.



Save this code as a template (LeftLane.tpl)



Mirror the template and save it as another template (RightLane.tpl)



Step 7.



Clear the screen.



Insert the previously saved LeftLane.tpl and RightLane.tpl (one at a time) by the right mouse click after selecting the "Points" node in the Section3D Editor.



Select the first point of the the second lane and map it to the first point for the first lane by the right mouse click followed by "Edit Dialog".



Remove the overlapping points (there are two in this example)



Save this as "BothLane.tpl".



Create and save the next six partial templates(LeftSideWalk.tpl, RightSideWalk.tpl, LeftFillSlope.tpl, RightFillSlope.tpl, LeftCutSlope,tpl, RightCutSlope.ptl) in the same way.



Step15:



Step16:



Create a new Cases Group called LANE and insert BothLane.tpl after selecting the Points node under the Case1 - This is a good way to organize the Lane template data in the final full template which consists of a number of cases. Some cases are for making decision and some cases may be just for grouping a set of points/links for the purpose of organization and readability.



Insert the LeftSideWalk.tpl after selecting the connection point.



Insert the LeftCutSlope.tpl and LeftFillSlope after selecting the connection point from the Left Sidewalk.



Repeat the previous two steps for the right side. After all partial templates have been combined into one full template, you can test the behaviour of the full template graphically (Select the Center point -> Right mouse click -> Edit Graphical -> move the cursor point)



You can now save the entire template code with all components (lane, sidewalk, cut/fill slopes) as a full template. Keep in mind that this full template was designed for future reuse and modification. Thus, the mapping of the points to Civil3D objects (alignment, profile, superelevation, etc) are implemented only after loading a full template as you will see in the next steps..



Load the full template (Editor->File->Load Template) and map the first point (crown) to the design alignment and profile.



You may want to exaggerate the vertical scale so that 1% grade can be differentiated from 2% grade.



You can map all twelve horizontal transitioning points to the alignments (Select the point->Right Click->Edit Dialog->Select X(offset)->Right Click->Alignment. All of the the transition points are obvious except the existing edge of pavement point (point 6 & 28). Point 6 should be mapped to alignment L2 and Point 28 to R2.



This is probably the right time to mark the key points and marked name should be unique. Note that the daylight point should be marked twice for both cut and fill situations.



After completing the transition mapping and marking points apply the current X-Section to a station range to write the data to the entire sample line group.



If absent create the Assembly and attach the Section3D subassembly, and create the corrirdor using "Create Simple Corridor". Corrior sampling rate should ideally match the sample line intervals.



Step 28



You can plot the Cross Sections after adding the newly created corridor as a new source to the sample line group (Select the sample line group->Right mouse click->Properties->Sections Tab->Sample more sources). You can also apply the X-section point/link/shape labels and and styles in the corridor properties dialog box.