I model Top of Curb with my Corridors. Our pavement section has a 2% cross slope. Depending on the width of the road, the Top of Pavement is either above or below the Top of Curb, but never even. It works fine on everything but Intersections because the Intersection Wizard creates its own offset alignments and profiles based on the slope of the pavement. BUT it begins at the Assembly Insertion Point and not the ACTUAL top of pavement. Basically I move the pavement vertically until the Top of Curb is even with the Assembly Insertion Point. This makes the Profile elevation = Top of Curb. I have attempted to add an Offset Assembly and attach the pavement to that, but got the same results. So, how do I get the Intersection Wizard to recognize this offset? My Assembly is attached as a pic. Thanks!
I believe that the OP is designing the road using the centerline as the horizontal control point, and the top of curb as the vertical control. If the road cross section is constant then that could work. Notice in the picture that he has moved the assemblies so that the crown is below the assembly insertion point.
For the OP - you would probably be better off if you change the assemblies used for curb returns so that their baseline is at the top/back of curb instead of at the edge of the gutter. That way your curb design profiles would work directly, without any need for adjustments. Note - this would also mean that your curb alignments would have to follow the back of curb. You would also have to set the lane slope defaults in the intersection wizard to zero.
Can you post a sample drawing, that I can experiment with?
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Well, when I say that I "model the top of curb" it means that the Profile for the Centerline represents the top of curb elevation. In actuality, you are always modeling center of pavement. But by moving my Subassemblies down, I can force the profile to = top of curb elevation. All is well until you need something to target the actual top of pavement at centerline.
PROBLEM 1: Subassemblies only target profiles, which is why I believe I need to add an "expression" for lack of a better term to tell the subassembly to target the profile, but then subtract 0.2008' from that elevation. But that is only one of the issues with these intersections.
PROBLEM 2: The other being that the profile for the offset alignment winds up 0.2008' too high as well due to being offset from the profile at -2.0% for 13.5'.
I am intrigued by the suggestion made to change the connection point of the curb for the curb return align/prof but do not know how to do that. I will attach my drawing so you can tinker with it. For some reason now the pavement and sidewalk are not being created even though the target align/prof appears to be correct. Sheesh!
I think that maybe if I leave my subassemblies at their current -2.008' offset but change the Slope in the Intersection Wizard to -2.85% for the 36' road and -3.49% for the 30' road from their normal -2.0% I may actually get the edge of pavement and curb return profiles at the correct elevation. That potentially solves PROBLEM 2 but I do not see a solution to the issue of targeting back to the centerline profile mentioned in PROBLEM 1.
Many thanks for the assistance!
All is well until you need something to target the actual top of pavement at centerline.
People who need to model by TOC or Gutter Flowline profiles have to construct their Assembly backwards in Civil 3D:
I agree this is the way to go Fred but doesn't the link on the generic subassembly need to be turn off in the code set to prevent modeling issues?
Doesn't seem to be so far.... What issues are you thinking John?
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