How to get a "smooth road mesh" on a complex road (lots of verticality and rotations)?

I have a mountain road which is quite twisty and turny. On the more complex turns, the mesh/collision becomes very triangular and clunky:

I’ve tried scaling the road down on the the x-axies which didn’t work:


I’ve also tried scaling down the mesh on x:

None of these seems to increase the “spawn frequency” of the mesh/whatever controls these collision triangles.

Anyone have an idea how to make it smoother?