I'm not sure if it works in the other rounds, but in the final heat, if I do not move as the race starts (I also held brake just in case I get launched off), one of the cars behind me collided into me and was spinning around like crazy. It spawned behind me again, but a little more to the left, only to collide into me once again and spin like crazy. But as it spawned again, it was far enough from me to cross the starting line and race.

Again, I'm not sure if it works in the first 2 rounds, and I'm not sure if this is a bug, but I know that cars do not spin around like tops when they collide into the rear of a static car... XD