Self Intersecting Alignment and Plan Production

I am currently working on a large interchange project and am experiencing some weird results when generating plan named boundaries for a self intersecting alignment (e.g. cloverleaf). The left alignment in the image below is the subject geometry. I'm using a client supplied template and don't really understand if this is a defect in the OpenRoads platform or an issue with the way the geometry for the alignment was constructed. Seed scale and overlap settings make little difference. The named boundary element placement goes out of whack at the point of self-intersection and does not follow the stationing sequence. I am a new user to OpenRoads, but have a heavy background in Civil3D. Any assist that can be provided to troubleshoot this would be greatly appreciated. 

  • Self Intersecting alignments create a problems.  The only solution of which I am aware is break the alignment into two different alignments.  I would try to find a break point which is far enough past the intersection to allow building the entire intersection geometry but short of the beginning of the curve so that superelevation transition can be accomplished all on the second alignment.

    You'll need to set the 2nd alignment start station to match the station at the end of the 1st alignment, of course.

    The only real downside to this workaround is that you must juggle 2 alignments and corridors instead of just one, but that is not much of a burden.

    Robert Garrett
    Senior Consultant

    www.envisioncad.com

    Answer Verified By: Steven Cowley 

  • That was my assumption in regards to the self-intersecting geometry being an issue. I will have to work with the geometry provider to find a suitable location to make the alignment break. Thank you for the feedback.