-- All over the World, as well as in Turkey, the number of vehicles that enter traffic is increasing everyday. The number of traffic accidents increases correspondingly with the number of vehicles on the roads in our country. Moreover, in Turkey unlike in developed countries, freight and passenger transportation roads are also mainly used by vehicles, which are not safe. For this reason, the analyzing of traffic accidents' is being so important each single day. At this point, for reducing the loss of life and property and for detecting the real causes of traffic accidents Directorate General of Security's database, The General Command of Gendarmerie's database, General Directorate of Highways' database, Insurance Information and Monitoring Center's database and hospitals' databases must be integrated. If an integrated system is provided to the decision makers, traffic accidents can be analyzed with all details and the decision makers can carry out preventive measures and practices thanks to detecting the real causes of accidents. For this purpose, primarily general information about traffic information systems is presented that have been using for traffic accident analysis in our country and world. After that, "Traffic Accident Information Systems" which enables the decision makers to visualize accident reports digitally and provides help to take preventive measures and practices is presented. This system has all information about the traffic accidents and helps decision makers' to analyze accident data in a wide variety of criteria. This results with an effective decision support systems which helps to expose the real reasons of accidents and helps to reduce to the loss of life and property.