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FHWA Home / Safety / Roadway Safety Data Program (RSDP)

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

HSM Informational Resources

  • HSM Implementation Guide for Managers
  • Integrating the HSM into the Highway Project Development Process
  • Scale and Scope of Safety Assessment Methods in the Project Development Process
    The Federal Highway Administration recently released Scale and Scope of Safety Assessment Methods in the Project Development Process, an informational guide that assists State and local agencies in identifying and applying suitable methods for quantitatively assessing the safety performance impacts of project development decisions such as comparing various design alternatives. The guide suggests assessment methods that may be suitable for answering safety performance-related questions that typically arise during each phase of the development process and for projects of various types. It also provides examples that illustrate the thought process for selecting a safety assessment method. This information on safety performance can then be considered in concert with other project criteria to make more informed highway investment decisions.
  • State Policies and Procedures on Use of the Highway Safety Manual
    The Federal Highway Administration (FHWA) recently released State Policies and Procedures on the Use of the Highway Safety Manual (HSM), an informational report for States developing policies and procedures on use of the HSM in transportation planning and programming, engineering and design, operations and maintenance, and roadway safety management. The report provides noteworthy examples of existing language in States’ policy documents and procedures manuals as well as sample policy and procedures language. The HSM provides methods for estimating safety performance that help practitioners, managers, and executives effectively implement strategies to reduce the number and severity of traffic crashes.

    You can find additional FHWA information resources to help implement the HSM at the Roadway Safety Data Program. FHWA's Every Day Counts Data-Driven Safety Analysis Initiative offers State and local agencies technical assistance and training in implementing the HSM; for additional information.

HSM Training

HSM Case Studies

HSM Related Tools

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.

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Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000