Death, disability, human suffering and material loss or damages are direct effects of road accidents. This problem is increasing from year to year at an alarming rate, especially in developing countries. Compared with international risk fingers, Ethiopia, particularly; Addis Ababa is one of the worst examples in terms of fatality rate per vehicles. This book attempts to analyses the level, the major causes, and contributing factors of traffic accident in Addis Ababa. Road junctions (nodes) and road segments (links) are usually seem to be more exposed to traffic accidents. And my book finds out why they exposed and assesses measures that have been taken regarding traffic accident and road safety of the city. Moreover, it reviews studies on different aspects of road and traffic factors. Finally, it summarizes the findings and recommends the possible solution to reduce traffic accidents and to improve road safety in Addis Ababa.