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The Dynamic & Intuitive Control Experience (DICE) is an experimental system that could allow people to control cars by moving their hands in front of sensors. It also has options to access social media and entertainment options while driving. What could possibly go wrong?
Link -via DVICE
Similar things apply to such a system in a car, but safety becomes an issue as well. It would certainly distract the driver if a passenger caused something to happen by waving their arms, even if that event was non-critical such as the radio suddenly switching on.
Of course Douglas Adams predicted all this years ago. "For years radios had been operated by means of pressing buttons and turning dials; then as the technology became more sophisticated the controls were made touch-sensitive - you merely had to brush the panels with your fingers; now all you had to do was wave your hand in the general direction of the components and hope. It saved a lot of muscular expenditure of course, but meant that you had to sit infuriatingly still if you wanted to keep listening to the same programme."