A Diploma Thesis titled ‘Multilevel investigation of road accident characteristics in Greek cities‘ was presented by Dimitris Spanakis in March 2013. For this analysis, a database was developed with road accident data from the Hellenic Statistical Authority in 30 Greek cities for the period 2006-2010, which has been complemented with cities demographic data: population, vehicle fleet, and per capita income. From the results, useful conclusions are deducted for the impact of some of the examined parameters in the number of fatalities, serious and slight injuries in Greek cities, such as existence of median, operation of technical night lighting, accident type, vehicle type, casualty age and vehicle fleet. From the second level analysis it was found that there is significant variation of the impact of the vehicle fleet of each city to the number of casualties in road accidents, which was quantified.