Highway Safety Manual

The Highway Safety Manual (HSM) is a comprehensive guide used by transportation professionals to improve road safety. It provides research-based methods and tools to analyze crash data, identify safety issues, and evaluate the impact of various roadway or traffic changes. Its goal is to help engineers and planners design and operate roads that reduce crashes and save lives. The HSM combines statistical models and best practices to support decision-making, ensuring that investments in transportation infrastructure are both effective and efficient in enhancing safety for all road users.