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Latest Tool Updates 

Updates were made to the Urban and Suburban Arterials spreadsheet in April, 2020, removing redundant application of calibration factors in segment and intersection models when calculating pedestrian and bicycle crash frequencies.

Updates were made to the Rural Two-Lane Roads and Rural Multilane Highways in July 2019, addressing comments by the AASHTO Highway Safety Manual Steering Group, making minor improvements to formatting and reporting structure for ease of use, and modifying instructional text for improved clarity and consistency.

 

The Highway Safety Manual (HSM) is the premier guidance document for incorporating quantitative safety analysis in the highway transportation project planning and development processes. How can we help you?

What is the HSM?        Who uses the HSM?        How do I use the HSM?

 

What's coming next?        Where can I buy the HSM?        Frequently Asked Questions

While this web site is hosted by AASHTO, the Association works closely with the Federal Highway Administration (FHWA) Office of Safety (click here to visit the FHWA HSM web page) and the Transportation Research Board (TRB) Highway Safety Performance Committee on the content, software tools and training related to the HSM.