Traffic accidents on the roads are one of the most common causes of human death and human injuries in modern societies. Progress in collecting data about subject of research has introduced changes in various fields of science and engineering. The field of transport engineering tracks progress and trends in other areas. One of the main tasks of smart cities' projects is the analysis of large amounts of data collected from the participants in road traffic. These data are used for the purposes of traffic planning, traffic regulation, traffic congestion management and for increasing public safety. Traffic accident databases are the most important source of data for analyzing and defining preventive actions. A large amount of data about traffic accidents are collected, but they are available for analysis to a few institutions and people. Concept of open data represents a new concept that has been started to apply in the Republic of Serbia. The paper presents a partial analysis of open data for traffic accidents in the city of Belgrade in 2016