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Tool Descriptions

​Crash Modification Factors Clearinghouse

The Crash Modification Factors Clearinghouse is a web-based database of CMFs along with supporting documentation to help transportation practitioners identify the most appropriate countermeasure for their safety needs. Click here for more information on the Clearinghouse.



SafetyAnalyst is a software tool used by state agencies for highway safety management. It incorporates state-of-the-art safety management approaches into computerized analytical tools for guiding the decision-making process to identify safety improvement needs and develop a systemwide program of site-specific improvement projects. SafetyAnalyst is applicable to Part B of the HSM. Click here for additional information on SafetyAnalyst.


Interactive Highway Safety Design Model (IHSDM)

The Interactive Highway Safety Design Model (IHSDM) is a suite of software analysis tools for evaluating safety and operational effects of geometric design decisions on highways. The IHSDM performs the predictive method for the facilities in Part C of the first edition of the HSM (i.e., two-lane, two-way rural roads, rural multilane highways, and urban and suburban arterials). Click here for more information on IHSDM.


NCHRP HSM Data Needs Research Digest

This digest presents a summary of the data needed to use Part C of the HSM. This includes rural two-lane highways, rural multilane highways, and urban and suburban arterials. Click here for more information.


Spreadsheets and ISAT for Part C Calculations

There are spreadsheets and the Enhanced Interchange Safety Analysis Tool (ISAT) and Users Manual to help new users understand how to apply the predictive method included in Part C of the HSM. The spreadsheets demonstrate the crash prediction procedure for rural two-lane two-way roads (HSM Chapter 10), rural multilane highways (HSM Chapter 11), and urban and suburban arterials (HSM Chapter 12). The ISAT can be used to evaluate freeway and interchange safety. Click here for a direct link to spreadsheets.