Transcript 2003 mtg FHWA Safety Analyst.pps

SafetyAnalyst
Overview Presentation
Michael S. Griffith
FHWA
June 2003
Creative Destruction
• “The stock market, like the economy, follows an
incessant path of creative destruction. New
technology, processes, and products continually
supplant the old and tired in a capitalist system.
New market leaders always challenge the old guard.”
(Investor’s Business Daily, June 2, 2003)
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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 costeffective means
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Why is SafetyAnalyst
Being 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
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Participating States
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Who is Developing
SafetyAnalyst?
• Federal Highway Administration
• Technical Working Group, 13 participating
states
• Midwest Research Institute and subcontractors
• ITT Industries, Software development
contractor
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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
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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
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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
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Target Audience
Professionals involved in deciding:
 Where to make highway safety improvements
 Determining what improvements to make
 Evaluating the effectiveness of implemented
safety improvements
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Modules
• 6 tools are incorporated in 4 modules
• Module #1 – Network screening
• Module #2 – Diagnosis and
countermeasure selection
• Module #3 – Economic appraisal and
priority ranking
• Module #4 - Evaluation
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Network Screening to Identify
Sites with Promise
• Use expected safety performance and
actual accident history to review sites
• Identify SITES WITH PROMISE – sites
that have promise for reducing
accidents in a cost-effective manner
• Review entire roadway system or
selected parts – roadway segments,
intersections, ramps, railroad grade
crossings, etc.
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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
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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
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Economic Appraisal of
Candidate Improvements
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•
•
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Assess expected project benefits
Assess expected project costs
Display results
Provide economic analysis and ranking
compatible with HSIP requirements
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Priority Ranking of Candidate
Improvements
• Ranking by economic appraisal results:
– Cost effectiveness ($/accident reduced)
– Benefit-cost ratio (B/C)
– Net present benefits (B – C)
• Project selection to maximize safety benefits
within a budget constraint
– Integer programming
– Dynamic programming
– Incremental B/C ratio
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Evaluation
• Use available data to estimate the safety
effect of projects implemented at specific
sites
• Before-after evaluations using robust
statistical techniques
• Primary MOE – percentage reduction in
accidents
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How Will Safety Analyst
Be 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
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What Has Been
Accomplished Already?
•
•
•
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Project began: April 2001
Meetings with TWG
Work plan and Marketing plan
White Papers with technical approaches
to modules
• Training course is being revised
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What Is the Planned
Schedule?
• “New Approaches to Highway Safety
Analysis“ training course – Fall 2003
• Release interim tools – 2004
• Release final tools – 2006
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SafetyAnalyst Website
www.safetyanalyst.org
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