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Calling while driving a car has become very common since the rise of mobile phones. Drivers use their phone despite the fact that calling in the car is potentially distracting and dangerous. Prohibiting communication while driving is not a good idea as there are also positive effects of calling (e.g., ability to notify about a delay, staying awake, preventing fatigue, guidance at foreign places).
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Pfleging et al. (2013) studied this question.
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