Spline Road

I’m building a spline for a road, I have to add a mesh collider then test with my car to see if it’s ok to drive on. Can’t have too steep of an incline need smooth hills and so on so the car drives smooth. When I’m done testing I can continue progressing the road further but then must test again by deleting the mesh collider and adding a new one. Will probably do this hundreds maybe thousands of times. Is there a way to update the mesh collider automatically when changes are made to the spline?