Sounds as if you need a more basic terminology tutorial. The road is a spline, the invisible track is a spline, just as the track itself is. "Spline" simply means that it will repeat as you drag the loose end across the terrain. An "object" on the other hand, does not repeat -- it just sits there waiting for you to do something to it. Objects that will connect to a spline will show white (or yellow) rings where splines (like a road) can be connected.
I don't have the means to create a video of this, but I am sure someone out there can help. I could, however, put up a series of snapshots with descriptive text. A video is better.
Bill