Interactive Highway Safety Design Model (IHSDM): Modules

The IHSDM suite of software analysis tools includes six evaluation modules:

• 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 2015 Release Crash Prediction Module includes capabilities to evaluate rural two-lane highways, rural multilane highways, urban/suburban arterials, freeway segments, and freeway ramps/interchanges (including ramps, collector-distributor (C-D) roads, and ramp terminals). 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.

For additional information contact:

Abdul Zineddin
Office of Safety Research & Development (HRDS)
Turner-Fairbank Highway Research Center
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101
abdul.zineddin@dot.gov