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HSM: Celebrating 5 Years Together

Celebrating 5 Years Together, Brian Ray, PE, and Casey Bergh, PE, promoting quantitative safety methods in transportation planning, design, and construction. Learn how the HSM toolbox enhances system planning and operations, with performance measures and predictive methods to improve roadway safety. Explore applications in network screening, crash modification factors, and systemic project prioritization. Discover data-informed safety management plans and corridor safety analysis examples. Find out about the 2nd edition production and upcoming enhancements. Contact Brian Ray or Casey Bergh for more information.

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HSM: Celebrating 5 Years Together

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  1. HSM: Celebrating 5 Years Together Brian Ray, PE Casey Bergh, PE

  2. HSM Promotes Quantitative Safety Methods

  3. HSM Promotes Quantitative Safety Methods Source: NCHRP 480

  4. HSM: A Multipurpose Toolbox • Planning, design, construction, operation, and maintenance • System Planning • HSM Part B • Project Planning & Preliminary Engineering • HSM Part B and Part C • Design and Construction • HSM Part C and Part D • Operations and Maintenance • HSM Part B, C and D

  5. Part B - Roadway Safety Management • Develop understanding of system needs • Inform countermeasure selection • Prioritize projects with potential for crash reduction

  6. Part B Performance Measures • Multiple performance measures available • Simple to rigorous • Data has limited most agencies

  7. Part C – Predictive Method • SPFs predict crashes for a base condition • Part C CMFs modify the base prediction to reflect physical conditions (e.g., left-turn lanes)

  8. Part D - Crash Modification Factors • Provided in Part D and online in FHWA Clearinghouse • Estimate change in crash frequency associated with a proposed modification

  9. HSM Applications in OR

  10. State/Region Network Screening Identifies Sites with Potential for Crash Reduction • Segment screening based on sliding window • ODOT ARTS systemic safety network screening focus areas • Roadway Departure • Bicycle and Pedestrian • Intersection

  11. ODOT Region 1 ARTS: Data-informed 300% Systemic Project Locations • HSM Performance Measure: Equivalent Property Damage Only (EPDO) average crash frequency • Selected to reflect the severity of reported crashes • Applied independently to intersections and segments • Weighting Factors (consistent with SPIS): • 100 for Fatal or Injury A • 10 for Injury B or C • 1 for PDO

  12. Region 1: Data-informed 300% Systemic Project Locations • Traditional Systemic Analysis • Use crash history to prioritize intersection crash locations

  13. Statewide Pedestrian and Bicycle Safety Implementation Plan • Risk-based Systemic Safety Analysis • Crash history is not sufficient to inform pedestrian and bicycle crash risk

  14. Data-Informed Safety Management Plan Example Bend, OR • Goal: Establish a safety management program • Understand crash patterns • Prioritize safety projects • Improve collaboration with other agencies

  15. Data-Informed Safety Management Plan Example Bend, OR

  16. Corridor Safety Analysis Example: SR 46 • Facility: 7.4 miles of two-lane rural highway in Seminole County, Florida • Goal: Evaluate crash history and identify countermeasures to reduce crash frequency and severity • Identify project cost-benefit ratios to justify funding and objectively prioritize projects

  17. Corridor Safety Study Example: SR 46 • Corridor crash trends • 30% rear-end • 24% run-off-road • 45% at night • Contributing Factors • Careless Driving • Failure to Yield ROW • Speed

  18. Corridor Safety Study Example: SR 46

  19. Corridor Safety Study Example: SR 46

  20. Corridor Safety Study Example: SR 46 • Tier I Projects • Low-cost rumble strips, signs • Tier II Projects • Moderate-cost shoulder widening, turn lanes, intersection lighting, etc. • Tier III Projects • High-cost passing lane, access management

  21. What’s Next? • 2nd Edition Production through NCHRP 17-73 • Incorporates Freeway and Ramp Prediction Models (Available now) • Additional Models (e.g., arterials with six or more lanes and one-way arterial streets) • Increased statistical rigor • Exclude Part D CMFs

  22. Questions? • Brian Ray • bray@kittelson.com • 503-228-5230 • Casey Bergh • cbergh@kittelson.com • 541-312-8300

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