When Lithuania joined the European Union, ensuring the road traffic safety became one of the most important problems. In Lithuania, official data collection is arranged if a traffic event caused an injury or a death of a traffic participant. In addition, the total number of traffic events is calculated. However, no data on tangible damage caused by a traffic event are fixed, if the event caused such damage only.  In addition, there are no official data on traffic events where nobody suffers and the traffic participants agree on the circumstances of the event. For systematization of collected data, certain data accounting measures are applied and the results are provided to the final data managers. This article consist of theoretical and practical research on the factors that predeterminate the accident rate in Lithuania heavy transport sector.