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 intersectionSecondary roadway corridor up to the Main roadwayFigure out some way to warp the resulting surface for all of the entry/exit roadways
My next thought isMain Roadway corridor up to the roundaboutSecondary Roadway corridor up to the roundaboutRoundabout as its own corridorFigure 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.MaryBPower InRoads 08.11.07.615
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