http://theness.com/neurologicablog/index.php/even-voice-operated-devices-cause-distracted-driving/
"We are in an awkward stage of technology at the moment. We have a plethora of electronic devices that we can use while driving, yet the computer technology to help us drive is not quite ready (although we are on the cusp). We may be living is a period of maximum distracted driving, with entertainment systems, now infotainment, GPS, cell phones, and complex environmental and other control to operate the car itself.
A new study shows that the problem is perhaps worse than most people realize. We’ll get to that in a moment.
Every control that a driver can operate distracts their attention from the road. This is because we have limited attention and cognitive resources. Obviously taking one’s eyes away from the road to look at controls is bad, but even without visual distraction, cognitive load is a problem.
Paying constant attention requires a lot of cognitive processing. When that processing is used for something else, there is less available for the task of driving. If you think you are particularly good at multitasking (doing two things at once) you’re not, and you may even be worse than average.
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