The relationship between speed management and projected traffic volumes on major roads along the WA network

Matt Albrecht, Kate Brameld

Research output: Book/ReportOther output


Increasing traffic volume has been shown to lead to a differing crash profile on regional roads, which is likely to result in a higher proportion of fatal and serious injuries. This has recently been seen on Indian Ocean Drive, a road following the coast to the north of Perth. Twenty five fatal and serious injury crashes have occurred on this stretch of road during 2012 - 2017 and this is likely the result of a large increase in traffic volume. This study has been undertaken to identify similar high crash risk sections of major routes leading out of Perth for up to 400km, taking into account expected increases in traffic volume over the next ten years. Crash numbers, densities, and rates along sections of these major
routes were analysed and potential crashes during 2024-2028 were estimated based on projected historical crash data and projected traffic volume data. The effect of speed limit reductions on these crashes was modelled. A total of 79 high risk road sections were identified based on the top 50 road segments according to the KSI metric density and the KSI metric rate, during the 2014 -2018 period. A further 12 sections of road where an increase in traffic volume may affect the crash profile were also identified. A 10 km/h average speed reduction on the 79 high risk road sections was found to have the potential to reduce the KSI metric by 76 crashes during 2024-2028. A combination of infrastructure improvement and speed management strategies is recommended to prevent serious and fatal injuries on our regional roads.
Original languageEnglish
Place of PublicationAustralia
Commissioning bodyRoad Safety Commission (Western Australia)
Number of pages54
Publication statusPublished - 2019
Externally publishedYes


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