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I think it depends on the driver -- example...
I can't concentrate on driving for FE (or in heavy traffic) and carry on a conversation in the car, let alone on the phone (even hands-free). But if I set the cruise on a long trip in thin traffic, I can talk all day.
I don't know if I'm alone, but for me, the part of the brain that engages decisions in vehicle operation must be closely tied to verbal conversation and aural interpretation. You'll rarely find me on the phone in the car (unless the boss calls or something similar).
The Biggest Problem around here is people TEXTING and driving (especially young drivers -- many who are barely comfortable operating a vehicle). Laws are slowly banning that activity. About a year ago here, several teens were killed in a head-on while someone was texting and crossed the center line at night. Senseless!
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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