In many countries, the usage of mobile phones while driving is forbidden. The prohibition is based on the non-use of one hand which can cause interference with the trained driving movements and not on the distraction due to the phone conversation. Therefore, hands-free phone kits are still allowed. But how much does a hands-free phone conversation distract the driver compared to listening to the radio or talking with a passenger? Collet et al. (2009) compared reaction time and heart rate at different secondary tasks while driving. While listening to the radio didn’t affected the reaction time, the reaction time while hands-free phoning and in-vehicle conversation was 20% longer compared to driving without any distractions. That means, referring to the reaction time, there is no difference between phoning and talking to a passenger. Also the mean heart rate, which gives a clue about the strain of the driver, was the same for talking and phoning. Both secondary tasks seem to stress the driver much more than listening to the radio. So what can we learn from that? If you want to concentrate while driving: shut up. Don’t talk to anybody. Turn on your radio instead. "Physiological and behavioural changes associated to
the management of secondary tasks while driving." C. Collet, et al. Applied ergonomics 40.6 (2009): 1041-1046.
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