Personally I prefer the method of using the hall-sensor like the outside-temp sensor does. If you use the pedal, it'll be switching as you touch the gas to move forward in a toll-booth line, traffic jam, etc. The hall-sensor can be tied to a timing circuit where you can set the MPH threshold so that it only opens when you're moving at a decent speed.

Cool idea though.

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Gone to the dark side

- Jeff