Abstract
Road Design Manuals propose the procedure for determining the accident rate at modern roundabouts by the probable number of major accident of types on specific sites of a roundabout per year. An assumption is made that the regression equation may not take into account the design features of modern roundabouts, climatic conditions, as well as driving style in the Russian Federation. The paper presents a step-by-step method of the regression equation validation to assess the accident rate at the approaches to the roundabouts on the basis of other statistical methods. The validation involves the statistical evaluation of the sample correlation coefficients between the accident equation and the factors affecting it. Within the work the values included in the equation were non-dimensionalized, necessary assumptions were introduced, and the features of performing correlation analysis in the particular case were analyzed. The procedure proposed enables to determine the reliability of the equation for determining the accident rate at the approaches to a modern roundabout in the conditions of the Russian Federation, taking into account climatic conditions, design features, the state of the existing road transport network, as well as driving style.
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