This weekend we had a BT20 league event at historic Francorchamps, and even tough everybody was well trained and well behaved, the races were ruined by chain collisions. Most of those were caused by an initial car going off and then the 'crash physics' causing a pinball like mayhem. How come crashing at 300kph onto a wall or barb wire fence will make the car bounce back so much? I might be naive here but maybe the fences and chassis of the car could have their 'coefficient of restitution' adjusted to be close to 0.0. Then if the wheels separate early enough in the impact simulation and the timestep/frequency is sufficient, they would bounce all over the place but the chassis would 'smash and slide' instead of 'smash and bounce'