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).

Module 1-610

Review

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