Point Controls/Secondary Alignments

Question

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

The Zen Dude · Answer

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?