WASHTO – BOISE IDAHO
Martin Kidner WYDOT
Joe McCarthy – JDI
Consulting
WYDOT
SAFETY MANAGEMENT
SYSTEM
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WYDOT
WHAT IS THE DATA-DRIVEN
SAFETY ANALYSIS INITIATIVE?
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3
WYDOT
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WYDOT
• “The Highway Safety Manual (HSM)
introduces a science-based technical
approach that takes the guesswork out
of safety analysis. The HSM provides
tools to conduct quantitative safety
analyses, allowing for safety to be
quantitatively evaluated alongside
other transportation performance
measures such as traffic operations,
environmental impacts, and
construction costs.”
WYDOT
HSM – DEFENSIBLE
APPROACH
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WYDOT
HSM PREDICTIVE MODEL
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WYDOT
COMPARE TO THE ACTUAL
OBSERVED
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WYDOT
EMPIRICAL BAYES CORRECTED
(“EXPECTED”)
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STATEWIDE SCREENING
EB correction
SPF & CMF
calculations
Roadway
Features
Facility types
Linear Reference System, Crash Data
State Highways
Public Roadways
Highways 72 % of fatal/incapacitating injury
crashes
Initial focus – rural 2-lane largest mileage
WYDOT
2-lane bidirectional Highways
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• Screen with confidence
– Hot spots that really will be hot spots in
the future
• Prioritize treatments with confidence
– Reduction in future crash
– Benefit / Cost ratios
Higher confidence in the expected future crash
numbers to better drive safety investment
decision
(*) SPF Models, site-specific CMFs, and Empirical-Bayes corrected crash
counts
WYDOT
USING HSM PREDICTIVE*
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• Library of approved treatment
types
– Traffic
• Locations to consider for safety
treatments
– Highway Safety
• Proposed safety treatments (at
specific locations)
WYDOT
SAFETY MANAGEMENT SYSTEM
– Project decision-makers
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WYDOT
LIBRARY OF TREATMENT
TYPES
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WYDOT
LOCATIONS TO CONSIDER FOR
SAFETY
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WYDOT
RECOMMENDED TREATMENTS
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• HSIP funds = 18M$
• 20:1 B/C ratio achievable
• 18M$ of treatments with 20:1
should result in an annual
reduction in critical crashes of 8.05
HSIP funds
$18,000,000
Benefit to cost average
20:1
Number of critical crashes per year that
can be theoretically reduced
8.05
An anticipated reduction of critical crashes by 1.5 per
district per year
seems to be an achievable target
WYDOT
TARGET SETTING
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20:1 target
WYDOT
63:1 average
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WYDOT
TREATMENT AND TARGET CONTRIBUTIONS
Target Crash Reduction
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CONCLUSION
– HSM gives predictive ability
• Mix systemic and crash data
treatment
• Data can assist
– With roadway features
– Rank order projects
– Determine realistic crash
reduction goals
WYDOT
• HSM gives a national standard
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Joe.McCarthy@wyo.gov (970-412-4022)
Martin.Kidner@wyo.gov (Planning)
Matt.Carlson@wyo.gov (HWS)
WYDOT
THANK YOU
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WYDOT
June, 2015
Safety Mangagement System
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WYDOT
http://shawbrothers.com
Safety Mangagement System
June, 2015 http://industrialpro.ca
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WYDOT
June, 2015
Safety Mangagement System
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“In his Introduction to Complex Thought,
French philosopher Edgar Morin reminds us
that the word complexity stems from
complexus: that which is fused together.
Furthermore, Morin assets that the problem
we sometimes have in the West is that we are
too accustomed to separating things. We need
to better learn how to draw links and
contextualize.”
WYDOT
COMPLEXITY
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• A State is eligible to use up to 10
percent of the amount apportioned
under 23 U.S.C. 104(b)(5) for each
fiscal year to carry out safety
projects under any other section,
consistent with the SHSP and as
defined in 23 U.S.C. 148(a)(4), if the
State can certify that it has met
infrastructure safety needs relating
to railway-highway grade crossings
and highway safety improvement
projects for a given fiscal year.
WYDOT
23 CFR 924.11,
IMPLIMENTATION
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