Topic 3 – Safety Management Process – Other Steps CEE 763
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CEE 763 Fall 2011 Topic 3 – Safety Management Process – Other Steps CEE 763
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Topic 3 – Safety Management Process – Other Steps CEE 763. DIAGNOSIS. 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, - PowerPoint PPT Presentation
Transcript of Topic 3 – Safety Management Process – Other Steps CEE 763
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CEE 763 Fall 2011
Topic 3 – Safety Management Process – Other Steps
CEE 763
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DIAGNOSIS
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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
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CRASH SUMMARY
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COLLISION DIAGRAMS
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SITE CONDITION DIAGRAM
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SELECT COUNTERMEASURES
Objective Select countermeasures that can effectively
reduce the crashes identified in DIAGNOSIS
Steps Identify contributing factors
• Haddon Matrix
Select countermeasures
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HADDON MATRIX
Example Haddon Matrix for Rear-end Crash
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CRASHES AT SIGNALIZED INTERSECTIONS
Angle crashes
Rear-end or sideswipe
Left- or right-turn
Nighttime
Wet pavement
Pedestrian/bicyclist
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CRASH MODIFICATION FACTORS (CMF)
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CRASH MODIFICATION FACTORS (CMF)
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CRASH MODIFICATION FACTORS (CMF)
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ECONOMIC APPRAISAL
Benefit-cost analysis Change in crash Convert benefits to $ Estimate project costs Benefit/cost ratio Non-monetary considerations
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ECONOMIC APPRAISAL
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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%.
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PRIORITIZE PROJECTS
Project prioritization Ranking by economic
effectiveness measures Incremental benefit-cost
analysis Optimization methods
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SAFETY EFFECTIVENESS EVALUATION
Evaluation of the actualeffectiveness Observational Before-after
studies
