I'm trying to see if we can make Geopak create a parabolic superelevation. We are doing a project that is utilizing TxDOT roadway criteria and TxDOT requires a parabolic superlevation transition. Here is a link to the exhibit that shows what I'm talking about: http://onlinemanuals.txdot.gov/txdotmanuals/rdw/2-1.pdf. If Geopak will do it, then I'll just create an input file from that and load into Roadway Designer. I tried to see about creating an *.sup file based on TxDOT criteria for Roadway Designer but not sure I understand the components of that input file. Plus, not sure it will apply a parabloc transition.
Rick,
If you apply superelevation and edit the control line, you have the option to set non-linear transitions.
But the break point of super is the V.C. PI, not the VPC.
Let us know if this meets your criteria.