Research on Severity Class Evaluation Based on Various Crash Situations Involved with Motorcycles for ISO 26262

ISO 26262 was established in 2011 as a functional safety standard for road vehicles. This standard provides safety requirements according to ASIL (Automotive Safety Integrity Level) in order to avoid unreasonable residual risk caused by malfunctioning behavior of electrical and/or electronic systems. The ASIL is determined by considering the estimate of three factors including injury severity. While applicable only to passenger cars at present, motorcycles will be included in the scope of application of ISO 26262 in the next revision. Therefore, our previous study focused on severity class evaluation for motorcycles. A method of classifying injury severity according to vehicle speed was developed on the basis of accident data. In addition, a severity table for motorcycles was created using accident data in representative collision configurations involved with motorcycles in Japan. However, because the existing data pertain only to the accidents that involve injuries or fatalities, we could not perform estimation for the non-injury class (S0). In this study, in order to improve usability of the severity table created in our previous study, we applied a wider variety of collision configurations, and considered an estimation method for S0 from data other than the existing accident data.