there is a lot more to it than purely change of momentum
martin baker did a lot of tests on the human body for ejector seats. they tend to base their calculation on the rate of change of acceleration.
the human body can withstand extremely high g if only for a short period of time so youre assumption is not wholey correct.
this is the best link i could find quickly: http://www.cavalrypilot.com/fm1-301/ch4.htm
you are correct to say that a like for like collision at a higher speed will result in more energy to be "released" but it is wrong to think that an accident is always more likely to occur at a higher speed.
if people drive to the conditions then there should be no need for speed limits. educating people how to do this is the key or just dont give them a licence.
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