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Here's an idea...
A 1-axis accelerometer with analog output tied to a comparitor with potentiometer adjustment connected to a relay in parallel with the brake light circuit.
In normal human-speak, a circuit that turns on your brake lights at a particular level of deceleration, regardless of that deceleration being caused by your brakes or your engine or a wall.
I have also considered that this circuit could be connected in such a way to rapidly blink your brake lights in the event of a hard deceleration. I think a few new cars are doing this with their centre brake light (maybe all of the brake lights, but definately the centre one)
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