 The article outlines the methodology of statistical analysis of failure rate of active safety systems in buses. The theoretical discussion is illustrated with calculations carried out on the basis of empirical data covering a four-year period of operation of selected models of buses at the motor transport company Wyshod PLC in Lublin, Poland. It was found that the distribution of distances traveled by the analyzed vehicles between successive repairs can be approximated by an exponential distribution. This article was authored by Paweł Drozdziel, Leszek Kruziwonos, Radovan Madelnak, and others.