A Diploma Thesis titled ‘Development of macroscopic models for the severity of road accidents with one or more vehicles’  was presented by Smaragda Kritikou in March 2011. The application of the four of log-rate models revealed the impact of various factors on the accident severity (type of region, intersection, weather and lighting condition, vehicle type, age and collision type). Single-vehicle accidents were found 2.4 times more serious than accidents with two or more vehicles and the severity of accidents for the pedestrians was found 1.2 times higher than that for the drivers and 1.4 than that for the passengers.