Originally Posted by
RomansFiveEight
Velocity changes the force of impact immensely. And as I understand it, it's exponential. Meaning 15mph vs 5mph is actually significantly more than 3x the impact. I don't know the formula for figuring that; but I've been led to believe that it is exponential (A friend and I were discussing the effect speed has on car accidents and he happens to come armed with an undergrad in Physics from MIT). So there is a LOT of difference in the potential for a serious injury between 5 and 15mph.
You could be walking at 3 MPH and get hit by a car going 30 MPH. I'd also suggest that you read @
rydabent's past posts to see what his arguments for wearing a helmet are like.
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The value of your life doesn't change based on the way you travel. - Dawn Schellenberg (SDOT)