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Interactive Highway Safety Design Model (IHSDM)

Interactive Highway Safety Design Model (IHSDM). Goal. To marshal the best available knowledge about safety effects of geometrics into a more useful and usable form for highway project planners and designers. What is the Interactive Highway Safety Design Model (IHSDM)?.

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Interactive Highway Safety Design Model (IHSDM)

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  1. Interactive Highway Safety Design Model (IHSDM)

  2. Goal To marshal the best available knowledge about safety effects of geometrics into a more useful and usable form for highway project planners and designers.

  3. What is the Interactive Highway Safety Design Model (IHSDM)? A suite of software analysis tools used for evaluating the safety and operational impacts of highway geometric design.

  4. Intended Usage • Throughout the highway design process (preliminary planning and engineering through detailed design to final review) • For existing and new alignments • On two-lane rural highways (2003 release)

  5. Components • Evaluation Modules • Policy Review • Crash Prediction • Design Consistency • Intersection Review • Traffic Analysis • Basic Services

  6. Policy Review Module Scope • Checks roadway segment geometry against relevant design policy and “flags” variations

  7. Crash Prediction Module Scope • Estimates expected crash frequency based upon roadway geometry and traffic volumes

  8. Design Consistency ModuleScope • Estimates 85th percentile speed profile along alignment to evaluate operating speed consistency

  9. Intersection Review ModuleScope • Policy Review • Diagnostic Review

  10. Intersection Review ModuleDiagnostic Review • Expert system that applies a systematic evaluation of an existing or proposed intersection geometric design to identify possible safety concerns and treatments • 27 concerns (configuration and alignment) • Treatments include design improvements & mitigation measures

  11. Traffic Analysis ModuleScope • Uses TWOPAS to estimate traffic quality of service measures (average speed and % time following other vehicles) Evaluates the operational performance of alternatives to passing and climbing lanes, and short four-lane sections

  12. 2003 Release • 1st public release of IHSDM • May be downloaded free-of-charge from IHSDM Web site • Technical support is available (see IHSDM Web site for details)

  13. IHSDM Web Site www.tfhrc.gov/safety/ihsdm/ihsdm.htm

  14. Training Course Pilot offerings of the IHSDM training course: • July 15-17 hosted by Washington State DOT in Vancouver • August 18-19 hosted by Central Federal Lands in Denver • August 20-21 hosted by Montana DOT in Helena • September 22-26 hosted by Wisconsin DOT in Madison • September 29-October 1 hosted by Mississippi DOT in Jackson • October 7-8 hosted by Maine DOT in Augusta Contact Ray Krammes: ray.krammes@fhwa.dot.gov or (202) 493-3312

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