A Diploma Thesis titled ‘Impact of mobile phone use on vehicle speed’   was presented by Xenia Karekla and Froso Kontodima in March 2008. An experimental process in real road conditions was carried out. Linear and lognormal regression methods were used to investigate the influence of mobile phone use and certain other parameters in the variable examined. From the models application it appears that the mobile phone use leads to statistically significant decrease of traffic speed. Furthermore, men and women drivers reduce the traffic speed similarly when they are using mobile phone.