module 1-6 0 intervention tools demonstrate the use of tools, such as statistical modeling, the...
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Module 1-61
Intervention Tools
Demonstrate the use of tools, such as statistical modeling, Demonstrate the use of tools, such as statistical modeling, the Australian model, the Haddon Matrix, engineering the Australian model, the Haddon Matrix, engineering studies, and road safety audits or assessments, for studies, and road safety audits or assessments, for identifying effective interventions.identifying effective interventions.
Module 1-62
Major Topics
Statistical ModelsStatistical Models
Engineering StudiesEngineering Studies
Road Safety AuditsRoad Safety Audits
The Australian Safe Systems ApproachThe Australian Safe Systems Approach
The Haddon MatrixThe Haddon Matrix
Module 1-63
The identification and examination of well chosen sites The identification and examination of well chosen sites will yield safety improvements…will yield safety improvements…
Models for Identifying Sites
Module 1-64
Example
0.83 0.00008( 1) 0.07( )
0.83 0.00008( 1 ) 0.0005( 2 )
0.06( ) 0.07( )
........
(0.436)( 1 ).......( )
i i i
i i
i i
AADT Drive
E y EXP βX
AADT AADTEXP
Median Drive
EXP EXP EXP
AADT Factor DriveFactor
Think about it …
Module 1-65
Step 1: Examine the Crash Data Step 1: Examine the Crash Data
Step 2: Conduct a Field StudyStep 2: Conduct a Field Study
Step 3: Identify CountermeasuresStep 3: Identify Countermeasures
Step 4: Prioritize CountermeasuresStep 4: Prioritize Countermeasures
Step 5: Implement the CountermeasuresStep 5: Implement the Countermeasures
Step 6: Evaluate the countermeasure impactStep 6: Evaluate the countermeasure impact
Engineering StudiesThink about
it …
Module 1-66
Road Safety Audits
A formal examination with a structured process;A formal examination with a structured process;
Conducted independently by professionals who are not Conducted independently by professionals who are not currently involved with the project;currently involved with the project;
Completed by a team of qualified professionals Completed by a team of qualified professionals representing appropriate disciplines; representing appropriate disciplines;
Focuses solely on safety issues; andFocuses solely on safety issues; and
Examines the transportation site with respect to all Examines the transportation site with respect to all potential road users.potential road users.
Module 1-67
The Australian ModelThe Australian Model
The Safe Systems ApproachThe Safe Systems Approach
Think about it …
Module 1-68
The Haddon Matrix
Crash TimeCrash Time
• Pre CrashPre Crash
• CrashCrash
• Post CrashPost Crash
Other FactorsOther Factors
• HumanHuman
• VehicleVehicle
• RoadwayRoadway
• EnvironmentalEnvironmental
Module 1-69
The Haddon Matrix (cont.)
http://www.tsc.berkeley.edu/newsletter/winter05-06/haddon.html
Note: Evans thinks the matrix places too much emphasis on the crash,
and that “Pre-crash” has usually meant the
seconds before the crash. However, that
view probably pertains to this matrix without
the fourth column (early Haddon matrix had only the first 3
columns).
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