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 Web-Only Document 348: Macro-Level Analysis of Safety Planning and Crash Prediction Models: A Guide, from TRB's National Cooperative Highway Research Program, provides guidance on how to use a spreadsheet tool developed during this project. The document is supplemental to NCHRP Research Report 1044: Development and Application of Quantitative Macro-Level Safety Prediction Models.