I am looking at site designer. It appears I can create a street that follows the terrain or is a constant level. I don't seem to able to get the road to follow my own levels.
Actually the toposurface will follow your street. You need to create a model line that your street will follow, then once you place the street the toposurface will adjust. Site designer tends to create a duplicate of original toposurfce, each at different building phase, so you can get total cut/fill volume.

Thanks for you feed back. The topo surface will follow the model line. but you can't draw a model line at a slope.
So I can't have one end of the road at 0m level and the other end of the road at 5m level
You can draw a slopped model line. In plane view, draw reference plane and give it a name value, then in 3D (or section parallel to this reference plane) set your workplane to be this reference plane and draw your model line.

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