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SafetyAnalyst

SafetyAnalyst. Michael S. Griffith FHWA July 2003. What is SafetyAnalyst ?. Vision Statement

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SafetyAnalyst

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  1. SafetyAnalyst Michael S. Griffith FHWA July 2003

  2. What is SafetyAnalyst? Vision Statement • Provide state-of-the-art analytical tools for use in the decision making process to identify and manage a systemwide program of site-specific improvements to enhance highway safety by cost-effective means

  3. Why is SafetyAnalystBeing Developed? • Both FHWA and participating state highway agencies have perceived a need to improve the analytical tools available to highway agencies for safety management of the highway system

  4. Participating States

  5. Who is DevelopingSafetyAnalyst? • Federal Highway Administration • Technical Working Group, 13 participating states • Midwest Research Institute and subcontractors • ITT Industries, Software development contractor

  6. Tools for Safety Management • To assist agencies in making better decisions about: • Where to make highway safety improvements • Determining what improvements to make • Evaluating the effectiveness of implemented safety improvements

  7. Target Audience Professionals involved in deciding: • Where to make highway safety improvements • Determining what improvements to make • Evaluating the effectiveness of implemented safety improvements

  8. Scope • Addresses site-specific improvements based on site-specific needs, not general programs like vehicle design improvements, occupant restraints, etc. • Uses state-of-the-art technology to advance the state of the practice • Should be comprehensive – including all stages of the safety management process

  9. What Tools will be Available in SafetyAnalyst? • Network screening to identify sites with promise for safety improvement • Diagnosis of safety concerns • Selection of countermeasures • Economic appraisal of countermeasures • Priority ranking of countermeasures • Evaluation of implemented projects

  10. Network Screening • Review entire roadway system or selected parts – roadway segments, intersections, ramps, railroad grade crossings, etc. • Identify sites with promise for safety improvement • Rank sites with promise for safety improvement • Select sites as candidates for diagnosis

  11. Types of Network Screening • Basic network screening • Screening for high proportions of specific target accident types • Detection of safety deterioration • Screening for high frequency of specific target accident types • Screening for corridors with promise

  12. Basic Network Screening • Two screening approaches: • sliding window • peak searching • Two measures of potential for safety improvement: • expected accident frequency • expected excess accident frequency

  13. Diagnose Safety Concerns at Selected Sites • Consider both sites with promise identified by network screening tool and from other sources • Identify accident patterns • Investigate causal factors • Consider site conditions and safety performance from engineering and human factors viewpoints • Assess whether a potentially correctable safety concern exists

  14. Select Appropriate Countermeasures • Present lists of countermeasures that are potentially appropriate for identified accident patterns and safety concerns • Final selection made by user • Where appropriate, user may select: • combination of countermeasures • alternative countermeasures for economic appraisal and priority ranking

  15. Economical Appraisal and Priority Ranking • Assess the cost-effectiveness of candidate countermeasures • Rank candidate countermeasures to assist choices among them • Select an optimal program of countermeasures to maximize systemwide safety benefits

  16. Types of Economic Appraisal • Cost-effectiveness • EPDO-based cost-effectiveness • Benefit-cost ratio • Net benefits

  17. Optimization • Considers multiple sites selected by the user • User specified total budget constraint • Optimization routine selects countermeasures to maximize safety benefits within budget constraint

  18. Evaluation • Assess the effectiveness of countermeasures based on a formal before-after evaluation • Evaluation results should be suitable for future use as AMFs in SafetyAnalyst

  19. Scope of Evaluation • Evaluation types: • percent change in accident frequency • change in proportion of target accident types

  20. How Will Safety AnalystBe Implemented? • SafetyAnalyst will be implemented as a set of integrated software tools to perform key steps in the safety management process • SafetyAnalyst will be made available to highway agencies by FHWA • SafetyAnalyst will be maintained as the state of knowledge advances

  21. What Is the Planned Schedule? • “New Approaches to Highway Safety Analysis“ training course – Fall 2003 • Release interim tools – 2004 • Release final tools – 2006

  22. SafetyAnalyst Website www.safetyanalyst.org

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