It is pure insanity that some apparently think vehicles with wireless connectivity and automated controls could even possibly be safe enough for use on public streets, when we've just had huge CPU/firmware bugs enabling total takeovers… some with no fixes available yet/ever.
That's all super tame. Instead try: worm spreads car to car, lies dormant, then at same moment during rush hour one day all cars randomly open throttle & disable brake or vice versa.
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I believe most cars have acceleration and breaks on a different bus than the one with direct external connectivity, but… not all and something clever enough might be able to jump the bus-bridge.
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"It's on a separate bus" is a joke. As noted recently Tesla even has their braking system's behavior tied in with the battery charging system in a way that messes up stopping distance badly.
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Many (most?) cars are now drive-by-wire (no mechanical linkage between accelerator pedal and throttle) and even if not they probably have the cruise control (second throttle cable) wired into interconnected systems in an unsafe way.
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All it takes is one flaw found by one person in one system that didn't need to be publicly accessible during all the lifetime of one vehicle model. Considering those factors, the probability of disastrous results is likely staggeringly high.
End of conversation
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