Since the integration of the new PhysX update in Unity my vehicle "bounces" when traversing across two different (perfectly aligned) road/wall colliders, and also when driving along curved/inclined track pieces. I don't believe this is a WheelCollider problem as I have removed the car's collision layer from my road layer in the collision matrix, which seems to avoid the problem. This problem can even occur when the vehicle is 5-10 meters (units) away from the upcoming change in the new track section. For my vehicle collider, I've tried using a basic convex mesh for my vehicle (which worked fine in previous versions of Unity), a primitive Unity cube stretched into a rectangle. I've also tried different friction settings for physics materials, different mesh import settings for the track, Unity planes/quads for the track pieces, letting the vehicle coast without any script running on the vehicle, trial-and-error in the project's physics settings... I'm still getting the same result. Starting to think this is a bug. Any help is appreciated! The videos below demonstrate what happens when crossing the threshold between two track pieces.