Creating Corridors for End Alignments: Housekeeping and Corridor Setup for Cul-de-sac

Solving Frequency Issues and Adjusting Corridor Parameters

Discover how to manage warning symbols, build corridors, and fix common issues in Civil 3D. This article provides a detailed step-by-step process to create a corridor, target alignment, and deal with any potential issues in the software.

Key Insights

  • The article explains how one can manage warning symbols in Civil 3D which may obscure important information. This can be done by selecting the alignment, going to alignment properties, editing the current selection, and turning off the warning symbols from the display tab.
  • It also describes the process of creating a corridor in Civil 3D. The process involves selecting the corridor, working with the cul-de-sac, choosing the end assembly, targeting the surface, setting the baseline and region parameters, and then setting up the target and frequency.
  • The article covers how to handle potential issues in the software, such as a spike in the cul-de-sac. This problem can be fixed by adjusting the curve increment in the parameters and removing the horizontal geometry points.

Note: These materials offer prospective students a preview of how our classes are structured. Students enrolled in this course will receive access to the full set of materials, including video lectures, project-based assignments, and instructor feedback.

In this video, we're going to go ahead and create our corridor for our end alignments. But before we do that, I have a little bit of housekeeping I want to take care of.

I don't know about you guys, but these warning symbols, they're going to start becoming a problem for me because they're obscuring the information that we're trying to work with. So I'm going to go ahead and do a correction on the display style or the object style for these alignments so that we can clear these warning symbols out. So I'm going to do that by selecting the alignment, going to alignment properties, going to my object style, dropping down, selecting edit current selection.

And then I'm going to go down to my display tab, my warning symbols, and I'm going to turn it off and hit apply and hit okay. And then hit okay again. And the warning symbols go away.

They're also gone here. I'm going to go up here and clear this warning symbol as well. I'm going to select that alignment, go to alignment properties, go to my object style, select edit current selection, go to my display tab, go to my warning symbols, turn that warning symbol off, hit apply, hit okay, hit okay.

And now it's gone. So I wouldn't recommend doing this all the time because you do want those warning symbols to show up sometimes. But I understand that the warning symbols that I had showing up were all tangency violated warning symbols.

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And I understand that the tangency is being violated and I just want them to go away. So I'm turning them off. We're not making any more modifications to the alignment.

So I know that no more warning symbols should be showing up inside of our drawing. So I'm good to go here. We're going to go ahead and start creating these corridors.

So I'm going to go ahead and drop down corridor, select corridor. I'm going to start working with this corridor or this cul-de-sac down here. So I'm going to go ahead and do dev main end.

I'm not going to type in a description. I'm going to leave it as basic C road core alignment profile. I'm going to choose my dev main end.

I'm going to choose my dev main end for my profile. I'm going to choose my end assembly. I'm going to target my civ 202 surface, and then I'm going to leave set baseline and region parameters as checked.

I'm going to go ahead and click okay. And now I have my baseline and region parameters window open. So inside of here, what I'm going to go ahead and do is I'm going to go into my frequencies.

I'm going to change my curve increment to something very small so I can get a good approximation of this cul-de-sac here because all it is curves. So I'm going to go ahead and choose something like two, and I'm going to go ahead and click okay. I'm going to go ahead and go to my targets, and I'm going to set my width or offset target to my center line alignment.

So I'm going to go ahead and choose my dev main. I'm going to click add, and I'm going to click okay. So one thing that I do want to touch on is that there are other options for targets.

You have feature lines, survey figures, and polylines for our widths. And then if you go into this transition profile slope or elevation targets, you have profiles and then also feature lines, survey figures, and 3D polylines. So just know that there's a dropdown up here if you needed to select a different type of object to target.

I'm going to hit cancel. I'm going to hit okay. And now that I have my target set up and my frequency set up, I'm going to go ahead and hit apply and rebuild this corridor and click okay.

Now you may have seen it pop up if you were watching over here when I hit apply and rebuild, but you'll notice there's this yellow line that showed up right here. Sometimes you can have an issue with your frequencies inside of Civil 3D that causes you a problem when you create something like a corridor. So I'm going to go ahead and click on this corridor and I'm going to go up to my object viewer.

And when I go to my object viewer and I bring that window in here, what you're going to notice is that there's this long spike that kind of sticks out from the end of my cul-de-sac right here. Now the cul-de-sac looks great, but there's this issue here that's sticking way out here. And my frequency might be a little high here.

So what we're going to go ahead and deal with is we're going to change some of these frequencies to try and get rid of that spike. So what I'm going to go ahead and do is select this corridor. I'm going to go to corridor properties and I'm going to go to my parameters.

I'm going to click on my frequency ellipses right here for my region. And what I'm going to go ahead and do here is I'm going to change my curve increment to something like five. And then I'm going to click okay.

I'm going to click apply and I'm going to click rebuild. And so if I click okay and I select this corridor and I go to my object viewer, we're going to see that that spike is still there. So that didn't fix my issue.

So I'm going to go to here to corridor properties. The spike that's happening here is most likely somewhere in this region right here. It's trying to target my alignment, but it can't catch it at the end point right here.

It's going all the way down until it hits this curve out here. And so that's what we're trying to remove is this assembly here that's trying to target that alignment. The rest of the time as we're coming around here, it's finding the alignment perfectly fine.

It's just at this end point right here. We're going to go to corridor properties. We're going to go to our frequencies.

And so my guess on what's happening here is that it has something to do with our horizontal geometry. So what I'm going to go ahead and do is add horizontal geometry points. I'm going to actually remove those horizontal geometry points.

I'm going to say yes to that. I'm going to hit OK and hit apply and hit OK. Now, for whatever reason, it didn't ask me to rebuild.

photo of Michael Kinnear

Michael Kinnear

Civil 3D Instructor

Mike is a Civil Engineer and a member of the American Society of Civil Engineers. He brings a wealth of experience working on transportation engineering and site development projects that involve working with Civil 3D, AutoCAD, and MicroStation. Mike is an avid hiker and enjoys spending time with his family in the local Cuyamaca and Laguna mountains.

  • Autodesk Certified Instructor (ACI)
  • Autodesk Certified AutoCAD Civil 3D Professional
  • Civil 3D
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