topic 3 – safety management process – other steps cee 763
DESCRIPTION
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 PresentationTRANSCRIPT
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CEE 763 Fall 2011
Topic 3 – Safety Management Process – Other Steps
CEE 763
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CEE 763 Fall 20112
DIAGNOSIS
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CEE 763 Fall 20113
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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CEE 763 Fall 20114
CRASH SUMMARY
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CEE 763 Fall 20115
COLLISION DIAGRAMS
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CEE 763 Fall 20116
SITE CONDITION DIAGRAM
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CEE 763 Fall 20117
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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CEE 763 Fall 20118
HADDON MATRIX
Example Haddon Matrix for Rear-end Crash
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CEE 763 Fall 20119
CRASHES AT SIGNALIZED INTERSECTIONS
Angle crashes
Rear-end or sideswipe
Left- or right-turn
Nighttime
Wet pavement
Pedestrian/bicyclist
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CEE 763 Fall 201110
CRASH MODIFICATION FACTORS (CMF)
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CEE 763 Fall 201111
CRASH MODIFICATION FACTORS (CMF)
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CEE 763 Fall 201112
CRASH MODIFICATION FACTORS (CMF)
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CEE 763 Fall 201113
ECONOMIC APPRAISAL
Benefit-cost analysis Change in crash Convert benefits to $ Estimate project costs Benefit/cost ratio Non-monetary considerations
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CEE 763 Fall 201114
ECONOMIC APPRAISAL
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CEE 763 Fall 201115
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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CEE 763 Fall 201116
PRIORITIZE PROJECTS
Project prioritization Ranking by economic
effectiveness measures Incremental benefit-cost
analysis Optimization methods
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CEE 763 Fall 201117
SAFETY EFFECTIVENESS EVALUATION
Evaluation of the actualeffectiveness Observational Before-after
studies