I am trying to find the easiest and simplest way to intersect two corridor surfaces. When I use the intersection feature, I can merge the intersection surface with one or the other profile pretty easily, and if I paste one surface onto the other, one road grade is maintained, but the other is destroyed. Also, even when I force the road grades right with lots of trial and error with breaklines, I cannot get the wider edges of the intersection to get to grade. Is there a better way?