Upon further investigation, I determined that clipping boundaries are like Masks only.
My Parking Road is a big loop, like a "U" on its side. So I made a bigger, "C" shaped shape element and then used it to clip my outer edges. The "C" is all I needed, since I did not need to clip at the start and stop edges.
Apparently, after making the clip, the originating clip object is no longer needed, so I was then able to take its edge that actually clipped my corridor and create a Civil Geometry with its elevation from Surface which I then ran a curb around it using a linear template.
My Parking Road is a big loop, like a "U" on its side. So I made a bigger, "C" shaped shape element and then used it to clip my outer edges. The "C" is all I needed, since I did not need to clip at the start and stop edges.
Apparently, after making the clip, the originating clip object is no longer needed, so I was then able to take its edge that actually clipped my corridor and create a Civil Geometry with its elevation from Surface which I then ran a curb around it using a linear template.