This Master Thesis aims time series analysis of basic road safety parameters in selected groups of countries”. For this analysis a detailed database was developed containing disaggregate road accident data from 15 EU Member States, while another data base was developed containing aggregate accident data for the 25 EU Member States for the period 1991-2001. After a general data analysis, the 25 EU Member States were categorized into three groups with similar characteristics. Using linear and non-linear regression models statistical tests were performed and concluded in the statistically significant parameters for each group of countries and each method that was used. The results lead to the conclusion that the increased traffic participation of two-wheel motor vehicles and pedestrians in southern countries of Europe as well as the passenger car motorization increases in the east countries, have a negative impact on road safety level of these countries.