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Role of SPFs in the Interactive Highway Safety Design Model (IHSDM). Mike Dimaiuta LENDIS Corporation. What is IHSDM?. A product of FHWA’s Safety Research and Development Program

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Role of SPFs in the Interactive Highway Safety Design Model (IHSDM)


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    1. Role of SPFs in the Interactive Highway Safety Design Model (IHSDM) Mike Dimaiuta LENDIS Corporation

    2. What is IHSDM? A product of FHWA’s Safety Research and Development Program A suite of software tools that support project-level geometric design decisions by providing quantitative information on the expected safety and operational performance

    3. What Benefits does IHSDM Provide? IHSDM results help project developers make design decisions that improve the expected safety performance of designs IHSDM helps project planners, designers, and reviewers justify and defend geometric design decisions

    4. Evaluation Modules (2008 Public Release) Policy Review Crash Prediction Design Consistency Intersection Review Traffic Analysis Driver/Vehicle

    5. Crash Prediction ModuleScope Estimates expected crash frequency based upon roadway geometry and traffic volumes

    6. What Highway Types can the 2009 CPM Beta Release Evaluate? Crash prediction capabilities matching the Highway Safety Manual, Draft 3.1 Facility types: Two-lane rural highways Multilane rural highways Urban & suburban arterials Existing and proposed alternative highway geometric designs

    7. Relationship between IHSDM and the HSM A. Introduction and Fundamentals Roadway Safety Management Process C. Predictive Methods (IHSDM CPM) Chapter 10: Rural, Two-Lane Roads Chapter 11: Rural Multilane Highways Chapter 12: Urban/Suburban Arterials D. Accident Modification Factors

    8. Relationship between IHSDM and the HSM FHWA intends IHSDM CPM to be a faithful implementation of HSM Part C methodology FHWA implemented new models and revised 2-lane rural model based on HSM Draft 3.1 (April 2009)

    9. CPM Model Components SPFs (Base Models) AMFs Calibration Factors Empirical Bayes (using crash history data)

    10. CPM SPFs are a function of… For Highway Segments: AADT Length of segment For Intersections: AADT of major road AADT of minor road

    11. SPFs – Highway Types

    12. SPFs – Collision Types 1 Adjustment factor only

    13. SPFs – Crash Severities 1Multi-Vehicle (non-driveway), Single Vehicle, Multi-Vehicle (driveway-related) 2Multi-Vehicle, Single Vehicle

    14. SPFs – Intersection Types 1 No specific base conditions and no AMFs; only applicable for generalized predictions

    15. SPFs – Collision Types 1 SPF for signalized intersections; adjustment factor for stop-controlled 2 Adjustment factor only

    16. SPFs – Crash Severities 1 Multi-Vehicle, Single Vehicle (all Intersection types) 2 Pedestrian-related (3SG and 4SG only)

    17. CPM Data Needs Vary by highway type rural 2-lane rural multilane urban/suburban arterials Highway Segment Data and Intersection Data

    18. CPM Data Needs - Segments

    19. CPM Data Needs - Segments

    20. CPM Data Needs - Segments

    21. CPM Data Needs - Segments

    22. CPM Data Needs - Segments

    23. CPM Data Needs - Intersections

    24. CPM Data Needs - Intersections

    25. CPM Data Needs - Crash History

    26. 2009 CPM Beta Release May be downloaded free-of-charge at: http://www.ihsdm.org Technical support: E-mail: IHSDM.Support@fhwa.dot.gov Phone: (202)-493-3407

    27. Future Plans Next Public Release in conjunction with the HSM 1st Edition (2010)

    28. Questions? For additional information: www.tfhrc.gov/safety/ihsdm/ihsdm.htm IHSDM Technical Support: IHSDM.Support@fhwa.dot.gov; (202)-493-3407 To download IHSDM software: www.ihsdm.org Shyuan-Ren (Clayton) Chen Clayton.Chen@fhwa.dot.gov; (202)-493-3054