Not sure where the actual numbers came from that they posted, but pedestrian fatalities correlates well with "hood height" of the vehicle. I'm referencing from memory here and would have to go digging for the actual source. The "hood height" could be slightly ambiguous but was taken as the point where the hood basically turns. Think about a 90's minivan and it's pretty low, a sedan is also low, a new gmc sierra or whatever is not so low.