Weekend fun project: CarCrash using Unreal Engine 4 and Nvidia Flex.
All vehicle interactions, including suspension, velocity, and friction, are physically based. Both cars are following a path to simulate an accident scenario (for example the van driver wasn't paying attention). If the force on the wheel reaches a certain limit, the constraint will break, and the wheel will fall off. So the simulation is accurate but exaggerated in this case. If the vehicle mass, speed, and surface conditions are modified, the simulation results will differ.