I have a streets layer that I have imported into CityEngine 2018.0. When I align the graph to the terrain, portions of my streets dip below the terrain and others--particularly in bridge situations--float a bit too high. I am aware that I can edit the streets and use the green handles to raise and lower portions of the street, but the node seems to be fixed in place and immovable. Often, if the node could be raised or lowered, I could align the street segment properly.
Graph clean-up doesn't have any effect. I feel like I am missing something basic. Is there a way to edit the nodes in this way?