By summing up the findings of the field surveys, it has been found that the authors of the mentioned studies looked into effects of using different modes of mobile phones while driving on driving performance (‘‘hands-free” and ‘‘hand-held”). In general, these studies have confirmed negative influence of mobile phone use while driving, which is reflected in a reduced driving performance in a way that the time of driver’s reaction increases and a vehicle loses correct position in the lane. The results of this studies have also demonstrated that using a hands-free mobile phone is not safer than using a hand-held mobile phone.