A Diploma Thesis titled ‘Comperative investigation of risk parameters in the Greek motorways’  was presented by Antonis Chaziris in October 2005. Data concerning the number and the characteristics of participants in traffic accidents were used, as well as raw accident data, which became available from NTUA’s Traffic Accident Database. The results of this research consisted of four mathematic regression models and two polynomial relations of cross-correlation of the accident indicator and the traffic volume, concerning the motorway of Attiki Odos.