This week I ran into two interesting examples of alignments that just didn't play well with the automated intersection design tools.
Case 1- The Loop:
It isn't unusual for an alignment to cross itself, however the intersection tool won't recognise the crossing location. Of course, the easy answer is to split it into 2 alignments. However, I wanted to build the intersection the pre-2010 way, manually creating curb return profiles and corridor regions the "old fashioned" way to see if I ran into any hiccups.
I was worried that C3D might get confused with the whole "Target nearest to offset" thing in the corridor parameters, however this ended up building without problem. The most difficult part was getting the right OSNAP for throwing on the station label at the intersection (as seen in the screen cap). I used trial and error until I got what I wanted.
One of the big things you need to remember in creating manual intersections is to make sure your crowns match.
To manually lock a PVI just jump into the profile geometry editor. Use the select PVI to make sure you're locking the correct one and set the Lock option in geometry to True.