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What if your car knew what you were going to do before you did it? What if, say, the car slowed down by itself in an emergency in response to your reaction, even before you had a chance to hit the brakes

Whether they know it or not, anyone who's ever gotten a speeding ticket after zooming by a radar gun has experienced the Doppler effect – a measurable shift in the frequency of radiation based on the motion of an object, which in this case is your car doing 45 miles an hour in a 30-mph zone.