Context Capture Editor TIN Model

Hi, I have produced a nice 3D mesh made of a highway exit ramp, however when I cretaed the TIN file the triangles projected through the edge of roadway making it difficult for CAD/Designer to distinguish the roadway and incorporate for his design. Therefore, I successfully drew in the lines on edge of roadway and incorporated that into the triangle network in the Context Capture Editor Scaleable Terrain Model but when I output a new TIN file these edge of roadway lines are not incorporated into it. See attached 2 Photos

Anyone know how this can be done?