Landscape splines: How to detach part of the spline from the landscape so it doesn't deform it at all?

Basically, imagine I want part of a road to be seperate from the landscape, so the landscape doesn’t deform to match it no matter how high or low it is etc.

What setting do I need to look for to get this effect?

Appreciate any pointers, many thanks.

Another reason to never use landacape splines.

Make a regular spline instead.
Apply deformation via bluetility script.

is there a tutorial video that deals with deformations via bluetility script? I really don’t know where to look for this.

Drag from the spline variable, type deform.
Should be the first option.

I’ll see if a tutorial is around on this, but didnt see anything at a glance.