[IR SS2] Set Profile for Circular Element?

I am working on a roundabout, and I am trying to figure out the best way to model/create it so that we can pull spot elevations.

My first thought is:
Main Roadway Corridor through the intersection
Secondary roadway corridor up to the Main roadway
Figure out some way to warp the resulting surface for all of the entry/exit roadways

My next thought is
Main Roadway corridor up to the roundabout
Secondary Roadway corridor up to the roundabout
Roundabout as its own corridor
Figure out the leftover warping of the resultant surface

No, I don't have any civil cells I can use, and I'm not sure I have the time to learn how they'd work.
I actually don't know if they even want me to do the modeling, but I'd rather try to figure that out than calculate all the spots by hand.

If I were to model the roundabout, would I do that as a corridor, or is that something better handled by a linear template? How would I "profile" my grade control circle?

Thank you.
MaryB
Power InRoads 08.11.07.615

Parents
  • The first and only roundabout I have done in InRoads was before Roadway Designer. I modeled the central roadway using two preliminary roads through the intersection to identify some target elevations at those key locations. Then I fine tuned the roundabout profile. As I did, I self referenced the profile to itself at each end of the profile so I could see how the exit grade lined up with the entrance grade at each end.

    Once I was satisfied with that, I created a corridor (or whatever the Roadway Modeler called them) that modeled the central island curbs and the road surface. I then created the outside edge of road profiles using the approach roads and central road to provide key elevations. I don't remember too many more specifics, but due to grade considerations, the central road was not a fixed cross slope but varied for each tie in. Once I had a good profile for each quadrant, I modeled the outside edges. As it turned out, the original proposal was for outside shoulders but that was changed to curb and gutter. Since the grades were all good, I simply deleted the breaklines created by the shoulder template and replace those templates with curb and gutter. I also had some special ditch grades which I was still able to reuse but not without some modifications.


    Charles (Chuck) Rheault
    CADD Manager

    MDOT State Highway Administration

    • MicroStation user since IGDS, InRoads user since TDP.
    • AutoCAD, Land Desktop and Civil 3D, off and on since 1996
Reply
  • The first and only roundabout I have done in InRoads was before Roadway Designer. I modeled the central roadway using two preliminary roads through the intersection to identify some target elevations at those key locations. Then I fine tuned the roundabout profile. As I did, I self referenced the profile to itself at each end of the profile so I could see how the exit grade lined up with the entrance grade at each end.

    Once I was satisfied with that, I created a corridor (or whatever the Roadway Modeler called them) that modeled the central island curbs and the road surface. I then created the outside edge of road profiles using the approach roads and central road to provide key elevations. I don't remember too many more specifics, but due to grade considerations, the central road was not a fixed cross slope but varied for each tie in. Once I had a good profile for each quadrant, I modeled the outside edges. As it turned out, the original proposal was for outside shoulders but that was changed to curb and gutter. Since the grades were all good, I simply deleted the breaklines created by the shoulder template and replace those templates with curb and gutter. I also had some special ditch grades which I was still able to reuse but not without some modifications.


    Charles (Chuck) Rheault
    CADD Manager

    MDOT State Highway Administration

    • MicroStation user since IGDS, InRoads user since TDP.
    • AutoCAD, Land Desktop and Civil 3D, off and on since 1996
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