Author Description

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. Supplemental to the report are NCHRP Web-Only Document 348: Macro-Level Analysis of Safety Planning and Crash Prediction Models: A Guide and a spreadsheet tool.