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Topic 3 – Safety Management Process – Other Steps CEE 763

Gain insight into crash patterns and causes to select effective countermeasures at candidate sites. Review crash statistics, assess field conditions, and identify safety concerns. Use the Haddon Matrix to select countermeasures. Perform economic appraisal and prioritize projects using benefit-cost analysis and optimization methods. Evaluate safety effectiveness through observational before-after studies.

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Topic 3 – Safety Management Process – Other Steps CEE 763

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  1. Topic 3 – Safety Management Process – Other Steps CEE 763

  2. DIAGNOSIS

  3. DIAGNOSIS • Objective • to gain an understanding of crash patterns and causes so that potential countermeasures can be selected at the candidate sites • Steps • Safety data review: crash statistics, collision diagrams, • Assess supporting documentation • Assess field conditions • Identify safety concerns

  4. CRASH SUMMARY

  5. COLLISION DIAGRAMS

  6. SITE CONDITION DIAGRAM

  7. SELECT COUNTERMEASURES • Objective • Select countermeasures that can effectively reduce the crashes identified in DIAGNOSIS • Steps • Identify contributing factors • Haddon Matrix • Select countermeasures

  8. HADDON MATRIX Example Haddon Matrix for Rear-end Crash

  9. CRASHES AT SIGNALIZED INTERSECTIONS • Angle crashes • Rear-end or sideswipe • Left- or right-turn • Nighttime • Wet pavement • Pedestrian/bicyclist

  10. CRASH MODIFICATION FACTORS (CMF)

  11. CRASH MODIFICATION FACTORS (CMF)

  12. CRASH MODIFICATION FACTORS (CMF)

  13. ECONOMIC APPRAISAL • Benefit-cost analysis • Change in crash • Convert benefits to $ • Estimate project costs • Benefit/cost ratio • Non-monetary considerations

  14. ECONOMIC APPRAISAL

  15. ANNUAL BENEFITS TO PRESENT VALUE Example: What is the benefit cost ratio for a countermeasure implementation that will cost $3,000,000, but with an annual benefit of $872,400? Assume service life is 5 years and a rate of return of 4%.

  16. PRIORITIZE PROJECTS • Project prioritization • Ranking by economic effectiveness measures • Incremental benefit-cost analysis • Optimization methods

  17. SAFETY EFFECTIVENESS EVALUATION • Evaluation of the actualeffectiveness • Observational Before-afterstudies

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