The Highway Safety Manual (HSM) is a tool that helps transportation agencies make data-driven decisions about safety. It includes methods for quantifying safety performance and predicting crash frequencies. The HSM is currently being updated to include macro-level crash prediction models, which can be used to assess safety trends at a regional or national level.
NCHRP Research Report 1044: Development and Application of Quantitative Macro-Level Safety Prediction Models, from TRB's National Cooperative Highway Research Program, details macro-level models, which have the potential to be a valuable complement to micro-level models, which are currently the only type of model included in the HSM.
National Academies of Sciences, Engineering, and Medicine. 2023. Development and Application of Quantitative Macro-Level Safety Prediction Models. Washington, DC: The National Academies Press.
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