05 · Hidden suicides

Some single-vehicle crashes are probably suicides. Here's the gap if research estimates hold.

In 2024, 360 men died as drivers or riders in single-vehicle crashes. Not all of them were suicides; most were not. Studies estimate that 1.1% to 7.4% of all crash deaths are deliberate. Most of those are single-vehicle crashes: in Australian coronial data, 72% of drivers who died by suicide in a collision were alone in a single-vehicle crash.

Share of crash deaths treated as suicide

1.1%

0% · official figures1.1% low estimate7.4% high estimate

2024: 2,541 vs 1,057

2.4× · 12 deaths reclassified

SuicideTransport crashes

This is a scenario, not official data. The percentage is applied to male land transport deaths and is capped at that year's male single-vehicle driver and rider deaths. The 1.1–7.4% range comes from international reviews (Routley et al., 2003; Hernetkoski et al., 2009), as cited in Yelo et al. (2021). Source: Australian Institute of Health and Welfare (2026); Bureau of Infrastructure and Transport Research Economics (2026); Yelo, D., Parkes, A., Freeman, J., & Davey, J (2021); Law, P. C. F., Too, L. S., Spittal, M. J., Pirkis, J., & Clapperton, A. J (2024).

Why not subtract every single-vehicle crash? Because the evidence doesn't support it. A South Australian forensic review found that most single-vehicle tree crashes look accidental: they involve younger drivers, alcohol, and winter conditions. Using the research range keeps the argument defensible.