This included:
- Stage 1 - resulting in the identification of risk factors.
- Stage 2 - ranking of high risk intersections.
- Stage 3 - recommendations of appropriate counter-measures to address these areas.
A summary of each report is detailed below.
Stage 1 report
Risk factors for killed and serious injury intersection crashes in metropolitan Perth: 2006 - 2015 (September 2016)
This study aimed at identifying risk factors for KSI intersection crashes in the Perth metropolitan area of WA from 2006 to 2015. Crash data from the Integrated Road Information System (IRIS) was modelled, to identify risk factors for crashes. The risk factors identified included:
- A crash on the weekend.
- At night time.
- At non-level intersections.
- At 3-way and 4 or more-way intersections versus roundabouts.
The research found that factors that reduced the risk of KSI crashes included rainy conditions, signalised traffic controls and multiple versus single vehicle crash types.
Stage 2 report
Identification of high risk metropolitan intersection sites in the Perth metropolitan area (December 2016)
The 2nd tranche of research identified and ranked 60 high risk intersections in the Perth metropolitan area to determine the intersections that required the most urgent attention.
Stage 3 report
Optimal resource allocation recommendations for safety treatments at Perth metropolitan high risk intersections (September 2017)
The final stage identified appropriate countermeasures for treatment of the high-risk intersections and allocated a cost and estimated reduction in the KSI metric using the Main Roads WA (MRWA) Crash Reduction Matrix. The suggested treatments range from grade separation or widening of bridges to modifying signals, adding lanes, installing roundabouts and extending turn pockets.
Road safety benefit:
This research was beneficial to the extent that the report -
- Provides a priority list of sites and counter-measures, which could be addressed via the Metropolitan Intersection Crashes (MIC) Program (administered via MRWA).
- Estimates potentially reductions in KSI crashes, dependent on investments.
