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Collision Modification Factors

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Presentation on theme: "Collision Modification Factors"— Presentation transcript:

1 Collision Modification Factors
Road Safety Audit Seminar Collision Modification Factors 15st May 2018 George Frisby

2 Presentation Methodology
Road Safety Audit Seminar May 2018 Presentation Methodology What is a CMF Where they are currently being used in Ireland Why they would be useful in the RSA process Examples CMF Sources Considerations in using CMF’s Summary

3 What is a CMF Road Safety Audit Seminar May 2018 CMF is the ratio of the expected collision frequency after a solution is implemented to the estimated collision frequency beforehand. i.e. CMF for replacing a crossroads with a roundabout is This means that collisions are expected to reduce by 38% as a result of implementing the above solution. CFM’s have been determined from studies where collision frequencies beforehand were compared to collision frequencies after implementing a particular solution CMF’s are used to compute the expected reduction in collisions after implementing a given countermeasure at a specific site A CMF of 1 would mean that there is an anticipation of no changes in the collision frequency and a CMF of 0 would mean an anticipation that the collision would no longer occur after the solution is implemented; therefore the lower the CMF the more effective the solution.

4 Where are CMF’s Being Used
RSI Process HD15 Assessments 2012: TEN-T network inspected 2012: Non- TEN-T routes inspected* 2013: Non- TEN-T routes inspected* 2014: Non- TEN-T routes inspected* 2015: Non- TEN-T routes inspected* 2016/17: Review of all RSIs 2016/17: Implementation of RSI Recommendations *Inspection order based on GE-STY Network Safety Analysis Results

5 Why use CMF’s Road Safety Audit Seminar May 2018 CMF’s are a useful tool to compare alternatives solutions. CMF’s can be used as a way to measure the effectiveness of a solution. It can help you determine if a particular solution will result in a significant reduction in collisions It will help you to choose the most suitable solution for a particular issue.

6 Example Embankment side slope on outside of low radius bend (400m)
Road Safety Audit Seminar May 2018 Embankment side slope on outside of low radius bend (400m)

7 Possible Solutions Increase curve radius Flatten the side slopes
Road Safety Audit Seminar May 2018 Increase curve radius Flatten the side slopes Provide a clear zone Install chevrons Erect Safety Barrier

8 Measure: Increase Curve Radius
Road Safety Audit Seminar May 2018 CMF of 0.77

9 Measure: Reduce Side Slope
Road Safety Audit Seminar May 2018 CMF of 0.85

10 Measure: Provide Clear Zone
Road Safety Audit Seminar May 2018 CMF of 0.49

11 Measure: Install Chevrons
Road Safety Audit Seminar May 2018 CMF of 0.78

12 Measure: Erect Safety Barrier
Road Safety Audit Seminar May 2018 CMF of 0.49

13 Summary Measure CMF Increase Curve Radius 0.77 Flatten Side Slope 0.85
Road Safety Audit Seminar May 2018 Measure CMF Increase Curve Radius 0.77 Flatten Side Slope 0.85 Provide Clear Zone 0.49 Install Chevrons 0.78 Erect Safety Barrier A review of the CMF’s suggests to provide a clear zone or erect a safety barrier Multiple measures at the same location? Some research say multiply the CMF’s while other say use the lowest. Using the lowest may under estimate the benefit while multiplying may over estimate the benefits.

14 CMF Sources Road Safety Audit Seminar May 2018 PRACT Repository(Predicting Road ACcidents - a Transferable methodology across Europe CMF Clearing House Repository TII Road Safety Remedial Measures Programme Austroads PIARC Safety Cube Repository Highway Safety Manual

15 CMF Sources Road Safety Audit Seminar May 2018

16 CMF Sources Road Safety Audit Seminar May 2018

17 CMF Sources Road Safety Audit Seminar May 2018

18 CMF Sources Road Safety Audit Seminar May 2018

19 CMF Sources Road Safety Audit Seminar May 2018

20 CMF Sources Road Safety Audit Seminar May 2018

21 Considerations in using CMF’s
Road Safety Audit Seminar May 2018 They are a starting point Use with caution Check collision type Use CMF’s that are stated to be reasonably accurate Target higher severity collisions

22 Summary Road Safety Audit Seminar May 2018 A CMF is a measure of the effectiveness of a particular solution Currently being used in the RSI process to determine the magnitude in the reduction of risk Knowledge of CMF’s useful tool in RSA’s, HD15, RSAI and in road design Various sources available to search for different CMF’s Number of considerations to be taken into account when using CMF’s

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