A systematic mapping review of surrogate safety assessment using traffic conflict techniques

• Conducted a systematic mapping review on surrogate safety assessment research. Provided comprehensive framework covering various aspects of traffic conflicts. Identified the critical research needs within field assessment. Fundamental is needed to develop crash-conflict relationships. Injury severity estimation using surrogates represents need. Safety road sections and networks have historically relied police-reported crash data. These data several noteworthy significant shortcomings, including under-reporting, subjectivism, post hoc causes contributing factors, limited behavioural information, omitted potential important crash-related factors resulting in an variable bias. Moreover, crashes are relatively rare events require long observation periods justify expenditures. The rarity leads moral dilemma—we must wait for sufficient accrue at site—some involving injuries even death—to then improvements prevent crashes. more quickly profession can end its reliance assess safety, better. Surrogate methodologies, contrast, proactive design, do not rely crashes, shorter timeframes which formulate reliable assessments. Although methodologies been developed assessed over past 50 years, overarching unifying does exist date. A will help contextualize role methodological developments begin productive discussion literature about how pieces or should fit together understand user risk This paper aims fill this gap by thoroughly conflicts methodologies. total 549 studies were meticulously reviewed achieve aim developing framework. provides consolidated up-to-date summary conflict measures metrics. Further work advance Critical include identifying set assessment, establishing rigorous relationships between ways capture behaviours into surrogate-based integrating estimation.