The relevance of the paper is due to the improvement of the mechanism for esti-mating socio-economic costs of road accidents, including - the sustainable safety index. In this regard, the study is aimed at analysing the mechanism for estimating the socio-economic costs of traffic accidents, followed by suggestions on the size and methods of implementing a sustainable safety index for improved and simpli-fied calculation. Analysed the impact of road accidents on the well-being of socie-ty. The object of the study is the mechanism of determining socio-economic costs of road accidents in Ukraine. The main research methods are the method of anal-ysis and mathematical statistics, thanks to which a hypothesis on the introduction of a new equation for estimating the number of socio-economic costs of road ac-cidents has been comprehensively proven and put forward. The paper presents the results of a study for improving the mechanism for estimating socio-economic costs of road accidents. The analysis of the mechanism of calculation of the index "social and economic costs of road accidents" is performed. The calculation of the socio-economic costs of road accidents according to the new equation makes it possible to reduce the probability of errors during calculations, allows to obtain an approximate result for planning road construction works at pre-investment stages or in the absence of all necessary initial data.
Keywords: Financing, distribution, working population, losses, economic effect