>>>>I'd suggest trying rate of change of velocity.

>>>What a great idea!  And here we were all wasting time talking about
>>>measuring accelleration.

>>One could reasonably infer, with a prospect of being in error, that 
>>he meant rate of rate of change, which may well be useful.

> Jerk.

Whether the effect of the magnitude of the second differential of 
velocity was sensed as a jerk would depend on whether the rate of rate 
of velocity change varied extremely rapidly, as in a panic stop, or 
whether the first differential of the deceleration has a more gradual 
slope as when eg one starts off braking gently and then gradually 
increases the braking as the gap shortens more rapidly than may have 
been intended, which of course only applies if one drives that way, as 
some jerks do.


        R :-) M


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