A Diploma Thesis titled ‘Comparative analysis of young drivers’ behaviour in normal and simulated conditions in interurban road‘ was presented by Marios Nikas in January 2014. This Diploma Thesis aims to compare the behavior of young drivers in normal and simulated driving conditions. Data were collected through an experimental process on a driving simulator but also on real traffic conditions, in which all the participants drove in both cases the same driving scenarios. Lognormal regression methods were developed for the identification of the impact of driving environment (simulated and real traffic conditions), basic driver characteristics (mileage, age, gender), as well as the driving style (average acceleration, deceleration and standard deviations of them) to the average vehicle speed change. Through model implementation, it was revealed that absolute values of drivers’ traffic performance vary between simulated and real driving conditions. On the contrary, relative differences of driver behaviour at the two driving environments remain mostly the same. More precisely, speed difference between fast and slow drivers is the same at the two driving environments, as is also speed difference the same at the two driving environments between drivers talking and not talking to the co-driver.