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How about the "I forgot to unhook the extension cord from the car before driving away" lockout?
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Zap! implements this with a relay on the throttle. 110 VAC disconnects the throttle, and high-pedal lockout prevents any shenanigans if you were to unplug while in "drive" mode.
That is an option, but then again a relay is a mechanical part that can fail. Bones' method involves fewer mechanical parts and less 110VAC wiring.
~Jimbo