In South Africa, annual car-jackings approach ten-thousand, not to speak of vehicle theft. An electrically triggered smoke bomb would be cheap and easy to build -- probably being ignited a few minutes after triggering. The question is the method of triggering. The original driver could trigger it -- but the driver may be immobilised. Or a "dead man's handle".
OBSERVATION: What if the driver should forget to "pull the handle"? In the case of car-jacking, one would need to alert only the driver to this -- perhaps done best through smell.
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