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Point Controls/Secondary Alignments

Nate Perius
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I'm working with SS2, Geopack 08.11.07.615, Roadway designer to design an interchange.

I'm attempting to use point controls/secondary alignments to model two roads merging together. Specifically, I'm trying to get my approach road's edge of pavement to match horizontally and vertically my main road's edge of pavement.

In my approach road's corridor I whent to point controls, selected my approach road's edge of pavement point, and selected both for the mode. I used control type alignment, selected my mainline's horizontal and vertical alignment and checked the box for "use as secondary alignment". I then input the horizontal and vertical offsets to go from my mainline CL to mainline EOP (44' horizontally, -0.88' vertically for reference), as measured perpendicular to my mainline .

When I view my cross sections the vertical "secondary alignment" line is at the correct offset but the point I set to be controlled isn't following that line but instead is 88' (twice my horizontal offset from my point control criteria) away from it. So for example the "secondary alignment" line at one station is correctly displayed at an offset of 19' from my approach road CL. But the approach road edge of pavement point (the one the point control is set for) is at an offset of 107' (88' away from where it "should" be).

Any suggestions would be GREATLY appreciated.

Thanks

  • 0 Offline
    Nate, do you have two separate Corridors? One for the Mainline and one for the Approach? I would use the edge of pavement of one of the Corridors as a Point Control ... "Corridor Point" type ...to stitch them together instead of trying to use the "Alignment" type with the Offsets. I don't know what might be happening there and why you would be getting the results that you are.

    Also, why would you need to toggle on "Use as Secondary Alignment"? Section-wise, isn't the Corridor ending the modeling (transversely) at the edge of pavement? Use as Secondary Alignment changes the modeling from that point outward so that it runs perpendicular to that Point Control, but isn't your modeling stopping at this location where you are just bringing the two models together?
     
    Civilly yours,
    The Zen Dude (also known as "Mark")
    Civil Software Guru & Philosopher
    InRoads User since its birth in the 80's
    OpenRoads Documentation / Training / Support
    Zen Engineering, Owner
  • 0 Offline in reply to The Zen Dude

    I do have 2 separate corridors and I thought about using the "corridor point" control type but I don't have the option to select my mainline corridor in the corridor dropdown. I'm assuming because my mainline corridor uses my approach road as a target alias for some special grading between the two at location further along my mainline corridor.

    The reason I toggled on "use as secondary alignment" is because if I don't the offset is measured perpendicular to the corridor's CL, and not the CL of my mainline. So instead of my edge of pavement being placed at a constant offset from my mainline's CL, it is placed at a point 44' away from the mainline CL but projected perpendicular to my approach road's CL.

    The below screen shot shows the triangulation that happens when I turn "use as secondary alignment off.

    The red line on the left is my mainline CL, the curving light blue line on the right is the approach road's CL, and the yellow line in the middle is my mainline edge of pavement line.

    You can see how instead of following the edge of pavement line the triangulation goes outside of it. That diagonal grey line is the 44' foot offset that the corridor is doing.

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