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Recently mentioned in another thread that may or may not have spun off of this one: Electric cars are so quiet they risk hitting pedestrians (who don't have the common sense to look both ways before crossing a street). This is actually also a problem with gas-powered cars, many of which make very little noise until they're right on top of you (literally!), as well as bicyclists.
Something that's waay overdue, then, is a personal collision detector that will signal you if you are on an interception course with anything bigger than and/or moving faster than you. Maybe it can be programmed with a familiar voice... I know if I heard my father's voice say "Look out, son!" I'd get outta that street fast!
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