Existing Cross Slope Analysis via Corridor Modeling

Good Afternoon,

I am trying to model the existing cross slopes of a 2-Lane roadway that is divided and contains a Baseline of Survey through the divided section of roadway. The template I have designed appears to target the corridor references in certain areas and not others. Two possible scenarios that I think could be the culprit is voided DTM areas as well as B-spline corridor references. I’m not sure if ORD can process the B-splines but I do remember SS10 having some issues with this. I have attached a couple screenshots to depict my issues. Also, where the roadway converges back to a typical 2-Lane the template doesn’t appear to even populate as well. Any help would be greatly appreciated.

Side items:

  • The corridor is set to Design
  • The template drop interval was set to 50’

  • If you have voided DTM in these areas, the template will not be able to determine where to place the points that intersect the terrain as it doesn't exist. The end condition that looks for existing ground would not solve and therefore not draw. 

    I know b-splines continue to present issues with terrains/surface templates in ORD, but haven't experienced the same issue with cross slope analysis. Are you featurizing the EOPs/EOSs and adding those as corridor references? 

    As a side note, I would consider creating alignments along the existing roadway itself to run your templates on. As it is shown now in your second picture, you'd actually get some slightly incorrect cross slopes because the roadway is not parallel to the baseline that you are pulling your template along. 

    Eddie Giese, PE
    Production Manager | Senior Roadway Engineer | Associate
    Licensed in FL & PA
    ACEC FDOTConnect Instructor on behalf of FDOT

    Patel, Greene & Associates, LLC
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  • Thanks for the reply, CO looked over the model and determined that since the BL Survey went through voided areas (active profile had gaps) the template was not populating even though there was existing ground under the actual template. The easy fix was to create an active profile for the BL, that way there weren't gaps in the active profile and that fixed the problem.

    I agree on the side note with creating alternative alignments to get more accurate cross slopes, the only issue is those alignments would need to be populated so that the reviewers would be able to correlate where the cross sections were actually being cut. From my previous discussions with CO they have recognized this issue with Corridor Modeling and I'm not sure there is actual fix for this yet. 

    Thanks again