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Introduction: The paper addresses a method to estimate the kinetic energy spent on deformations and the vehicle speed equivalent to such value during the reconstruction of road accidents. Purpose of the study: The study is aimed at improving coefficients used in the method and affecting the vehicle speed at the instant of a collision. Methods: The damage analysis algorithm measures the vehicle deformation to estimate the energy required to produce the measured vehicle damage, with regard to the principle of momentum conservation. Results: The stiffness coefficients used were developed long before the appearance of modern vehicles. Therefore, the authors propose to substitute the stiffness coefficients used for those considering modern trends in the automobile industry and ensuring much simpler and more direct calculation. It saves us the trouble to reduce experimental results to the formulation of force deflection and makes it possible to simulate damage behavior directly. The authors also describe the scope of application for the proposed coefficients, and restrictions of their use.

Increase in the number of two-wheeled motor vehicles (motorcycles, vehicles of category L3) is observed in the traffic of almost all countries in the world. That is why the number of victims and people seriously injured in the road traffic accidents (RTA) has considerably increased. The majority of RTA is the result of many factors which form together sets of different causes and effects. Identification of actual reasons having led to a traffic accident, as well as their attendant circumstances, is one of the most important tasks in ensuring traffic safety. On the one hand, configurations of two-wheeled motor vehicles have been significantly improved over the last decades, so it is necessary to align the analytical apparatus of estimating parameters of the braking process with these configurations. On the other hand, the current practice of expert analysis and settlement of accidents still involves estimation of increase in braking time and steady deceleration of motorcycles manufactured domestically during the past years, which hardly participate in the modern traffic due to their age. Both of these circumstances require review and adjustment, as well as formation of an updated basis of estimate for assessment of braking processes of two-wheeled motor vehicles in order to increase the reliability of RTA examination and determine compliance or non-compliance of driver’s actions with the requirements of traffic rules, establish the causes of accidents, evaluate a technical capability of a driver of the two-wheeled motor vehicle to prevent the accident. Settlement of all these issues can be provided by effective methods of calculation (quantitative) assessment, which are not available at the present moment.

The article is devoted to the development of a technique for the assessment of the influence of the structural reliability of transportation vehicles on their safety. This technique includes: an analysis of the automotive vehicle as a complex technical system, its structural elements greatly influencing road safety (RS); calculation of mean-time-between-failures and time for recovery of subsystems, assemblies and parts, probability of failure-free operation. As a result of the technique application, recommendations as to intervals of the replacement of automotive vehicle’s elements depending on the required probability of failure-free operation are released.

A system for the accounting of road infrastructure facilities' parameters specified during design and construction of motor roads. A study of parameters' condition was performed. Analysis of road accident rate statistics and identification of parameters to assess the efficiency of the proposed road construction activities aimed at the reduction in the number of road accidents were carried out. Actual data on condition parameters with the use of modern automated multi-functional diagnostic equipment were obtained. Actions aimed at the improvement of road infrastructure parameters through traffic safety enhancement, as well as actions aimed at the reconstruction of the motor road or project-supported construction of road segments were developed. Efficiency of the proposed actions was assessed.