David Van Horn wrote:

> What I think would happen, is that it would indicate that I was braking
> hard when I was just coasting down, and if I braked hard going uphill,
> it would probably miss that.
>
> Safety equipment that is unreliable, is worse than no safety equipment.

I dont think you get what I am trying to describe,

Immagine an accellerometer measuring gforce in the forward direction

If you start going downhill a accelerometer would gradually go from for example 
from 0g to 0.5g ( a gentle rollercoaster ) this would take several seconds and 
rate of change would be small and lights would not trigger, hitting the brakes 
would bring the 0.5g to 0.6 in a few tenths (hundredths) of a second  and would 
trigger the lights.

Similarly going uphil , a gentle rate of change from 0g to -0.5g the rate of 
change low (also in the wrong direction), no lights. now hit the brakes -0.5g 
to -0.4g in a few hundredths of a second. That's a high rate of change , so 
brakes and lhe lights go on.

Peter van Hoof 


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