Skip to content

Cannabis and road rafety: A review of recent epidemiological, driver impairment, and drug screening literature


Monash University Accident Research Centre - Report #231 [2004]

Authors: Lenné, M., Triggs, T., & Regan, M.

Full report in .pdf format [200KB]


Cannabis is the most commonly used illicit drug in Australia and is used by a wide section
of the community, particularly younger people. Contrary to data from the early to mid-
1990s, recent Victorian crash data suggest that the use of cannabis is associated with
elevated culpability in crashes. It is therefore timely to draw together the international
literature in regard to the issues around cannabis use and road safety. This report reviews
the key issues concerning cannabis and road safety, including: patterns of cannabis use; the
prevalence of cannabis in the driver population, drivers suspected of driving under the
influence, and drivers killed or injured; effects on simulator and on-road driving; detection
of cannabis in bodily samples; and measurement of impairment using performance tests
such as the Standardised Field Sobriety Test. The report highlights the current gaps in
knowledge and documents the specific areas of research that need to be pursued in future
studies in order to further enhance our understanding of how cannabis influences driving

Sponsoring organisation - Baseline Research Program - Department of Justice, Transport Accident Commission, VicRoads