it's about driver's concentration. Holding a conversation with somebody on a phone is more difficult sans body language than with a passenger. It also consumes more of the driver's attention than a pair a of sunglasses on your face or sandals on your feet. Listening to the radio is passive. They've been in cars for decades without any real controversy.
There's no real slippery slope. Cell phone use in a car is prolonged distraction. I say common sense should prevail, not paranoia.
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