[freemint]

How is total energy in crash a poor proxy? Yes there need to be confunding factors for a collision to happen but halving speed (and it being easier to loose speed at low speed) should more than half the energy that goes into breaking bones.

Yes there are interventions you can do to cut collision likelyhood by more than 75% but "poor proxy is unjustified".

[clairity]

the point is that speed doesn’t cause the accident, only makes it more severe. it doesn’t change casualty rates materially. what we want to reduce is the accident in the first place, and reducing speed doesn’t do that, only increasing driver attentiveness does that. once we better solve the attentiveness issue should we consider severity and speed’s contribution to it.