Drivers Can't Concentrate On Turning Left While Talking On The Phone

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Using a hands-free phone that leaves both hands free to steer may make the physical act of turning left at an intersection easier to pull off, but it doesn't make it any safer. That's because attempting to make a left turn at a busy intersection taxes the brain more than turning right or driving straight through. And having a conversation at the same time further impairs the brain's ability to focus on the road.
These findings, published in Frontiers of Human Neuroscience, provide neural evidence for why hands-free phone technology isn't a good alternative to cell phone use. Instead, it distracts the brain when it most needs to be paying attention to the road.
(thanks Miss Rare)