Highway Safety Manual
The Highway Safety Manual (HSM), published by the American Association of State Highway Transportation Officials (AASHTO) is the recognized source of information and methods for quantitatively evaluating traffic safety performance on existing or proposed roadways. The HSM provides a science-based, technical approach that helps State and local agencies take the guesswork out of safety analysis. FHWA has developed supporting implementation tools including the Interactive Highway Safety Design Model (IHSDM), the Crash Modification Factors (CMF) Clearinghouse, and the Systemic Safety Project Selection Tool. These tools will greatly advance state and local highway agencies' ability to incorporate explicit, quantitative consideration of safety into their planning and project development decision making.
The HSM provides a science-based, technical approach to facilitate consideration of safety in roadway planning, design, operations, and maintenance decisions. This allows safety to be quantitatively evaluated alongside other transportation performance measures such as traffic operations, environmental impacts, pavement durability, and construction costs.
Visit AASHTO's Highway Safety Manual Webpage at highwaysafetymanual.org.
This serves as the official HSM website where you can find the most up-to-date information and new developments on the HSM.
HSM Outreach Materials
HSM Technical Support
FHWA is promoting tools such as the HSM as part of its Every Day Counts Initiative: Data-Driven Safety Analysis.
*Disclaimer: FHWA cities specific tools as examples, not as an endorsement of these tools over others.