I can't explain this so i'll let the image explain
i do wanna do a similar thing myself for my pack, but more for placing traffic cars and less for making a path

I actually have the code set up to allow that for roads to allow for things like bridge supports and overhead lights/power lines/etc. Just needs a few code bits and it should work. Though you'll also need a GUI to tell MTS what triangles to render.

So it turns out this was not for components on roads. Was for a wholly different path system. As such, it's a wontdo.