SplineMesh GetRollAtDistanceAlongSpline returns 0


I use spline as procedurally generated road, so spline is generated during runtime and new points are added (while older points are removed) as game continues.

I need to get roll at certain locations to adjust roll of cars on the road. I move my cars along spline by using GetLocationAtDistanceAlongSpline and it works without problems. But get roll method returns 0 no matter what.

I set start and end roll of spline meshes by using SetStartRoll and SetEndRoll methods of SplineMesh. But I could not find how to transfer this information to spline itself.