A Diploma Thesis titled ‘Investigation of the effect of vehicle collision type on road accident severity in Greece‘ was presented by Olga Reitzopoulou in March 2015. Appropriately processed data for the period 2007-2011 in Greece were used from the ELSTAT datafile based on Traffic Police records and special log-rate analysis models were developed. Severity has been chosen to be expressed as the rate of number of persons killed and seriously injured divided by the number of slightly injured persons. The analysis led to the investigation of the impact on accident severity of the area type and the vehicle type involved. It appears that the severity is higher for passenger car and motorcycle occupants, while the vehicle type of the opponent car that affects more the severity is passenger car and truck. This impact is higher outside urban areas.