Interactive Highway Safety Design Model (IHSDM)

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Welcome to the Interactive Highway Safety Design Model (IHSDM) software download web site.


FHWA is very pleased to announce the establishment of a new IHSDM User Group. A User Group kick-off meeting (web conference) was held on August 15. Visit the IHSDM User Group page for details and to access a recording of the meeting.


On November 1, 2018, FHWA hosted a Data-Driven Safety Analysis (DDSA) webinar (IHSDM 2018 Web Conference) on “IHSDM 2018 - New Enhancements Support Data-Driven Safety Analysis”. A recording of the webinar can be accessed here and presentation slides can be accessed here.


The IHSDM - HSM Predictive Method 2018 Release (version 14.0.0; September 26, 2018) is now available free-of-charge. Major enhancements include:

  • Crash Prediction Module (CPM) Evaluation Reports: “Crash Frequencies and Rates by Highway Segment/Intersection” and "Crash Frequencies and Rates by Horizontal Design Element" tables were expanded to include crash frequencies for Total, FI, and PDO crashes. "Crash Frequencies by Year” (for Total, FI, and PDO crashes) tables were added. For evaluations using the Empirical-Bayes (EB) process, Expected, Predicted, and (Expected – Predicted) Crash Frequencies are now provided for each highway segment/intersection; a summary table comparing predicted and expected crashes for the evaluation period was also added.
  • Site-Based Data: The ability to export/import site set data of a specific site type (e.g., rural two-lane undivided highway segments; urban 6-lane divided arterial) via Export Site Data and Import Site Data options was added.
  • IHSDM Economic Analyses Tool (EA Tool): Default crash costs were updated. The EA Tool allows users to conduct economic analyses within IHSDM, using Crash Prediction Module evaluation results (crash frequencies and severities). IHSDM Economic Analyses Tool Help and an IHSDM Economic Analyses Tool Tutorial Lesson are available to help you get started.
  • IHSDM Tutorial: Lesson 4 (Crash Prediction Module) was expanded to include a Pennsylvania I-70 interchange alternatives analysis case study.


See Release Notes for the IHSDM 2018 Release for more details on enhancements. Please note: The IHSDM 2018 Release can be installed over 2011 and later versions of IHSDM.


Through this site you can complete the required registration process and, upon approval, download IHSDM. (Existing registered users, follow the “Download Login” link to access this update. New users, click on the “Download Registration” link.)


The IHSDM - HSM Predictive Method 2018 Release includes six evaluation modules: Crash Prediction, Policy Review, Design Consistency, Traffic Analysis, Driver/Vehicle and Intersection Review. To the extent possible, the Crash Prediction Module (CPM) faithfully implements Part C (Predictive Method) of AASHTO's 1st Edition Highway Safety Manual for evaluating rural 2-lane highways, rural multilane highways, and urban/suburban arterials, as well as HSM 2014 Supplement materials on freeway segments and freeway ramps/interchanges. For more information on IHSDM, visit FHWA's general IHSDM website and view the Every Day Counts (EDC) flyer describing IHSDM and how it supports FHWA's Data-Driven Safety Analysis (DDSA) initiative.


The web site is organized into the following pages:


You can learn more about the functionality of IHSDM and the IHSDM research and development program at the main IHSDM technology web site.