Hmm ... hadn't thought about the occupants leaning over and smooching at the light.

Thanks for the feedback on accident reconstruction. I knew 45 mph as significant but was just trying to envision the physics at play and trying to figure out how they got so hurt under that geometry. I knew the crash ratings were flawed due to be being "in class" but I had never heard about people sliding over the back of the seat/headrest. I feel bad for everyone involved in that accident (wouldn't want to carry that guilt with me for the rest of my life like the kid probably will) but am glad to learn from it.