Obviously, the biggest mitigator is speed. I won't spend much more time than that in terms of if the thing that it collides with or the bus itself is speeding; that's going to make the injury less and less survivable. With each increase of 10 or 15 kilometres per hour of speed, your survivability certainly does decrease. That's the first thing I look at with respect to survivability.
The next thing is going to be your injury patterns based on what happened to you in that compartment. As we discussed earlier, in a front-back collision, you're in a compartment, and you're typically more likely to survive if you're not belted. However, in the case of the rollovers and the ejections, if you're not contained within that compartment, you're more likely to sustain significant head injuries, and those are actually the number one killer, traumatically, in children.
Any way we can keep kids in their compartment, either by being belted or with other technologies that I've read about but won't discuss because I'm not an expert, would be the best way to mitigate potential injuries.