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The IHSDM suite of software analysis tools includes six evaluation modules and an Economic Analyses Tool:

  • Crash Prediction Module: Estimates the expected frequency of crashes on a highway using geometric design and traffic characteristics.
  • Design Consistency Module: Estimates the magnitude of potential speed inconsistencies to help identify and diagnose safety concerns at horizontal curves.
  • Intersection Review Module: Performs a diagnostic review to evaluate an intersection design for typical safety concerns.
  • Policy Review Module: Checks highway segment design elements relative to design policy.
  • Traffic Analysis Module: Estimates operational quality-of-service measures for a highway under current or projected future traffic flows.
  • Driver/Vehicle Module: Estimates a driver’s speed and path along a highway and corresponding measures of vehicle dynamics.

The IHSDM – HSM Predictive Method 2019 Release Crash Prediction Module includes capabilities to evaluate rural two-lane highways, rural multilane highways, urban/suburban arterials, freeway segments, freeway ramps/interchanges (including ramps, collector-distributor (C-D) roads, and ramp terminals), and roundabouts. The Policy Review Module applies to rural two-lane and rural multilane highways, while the other evaluation modules are only applicable to rural two-lane highways.

The Economic Analyses Tool allows IHSDM users to do economic analyses within IHSDM, using Crash Prediction Module evaluation results (crash frequencies and severities).

For additional information contact:

Clayton Chen
Office of Safety Research & Development (HRDS)
Turner-Fairbank Highway Research Center
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101

Updated: Monday, December 2, 2019