Characteristics of people who report both driving after drinking and driving after cannabis use

After alcohol, cannabis is the recreational drug most often found among dead or injured drivers. While the effects of alcohol on driving risks are well-described, the effects of cannabis on driving risks are less well understood. We have observed, in survey data, that the chances of past year collisions among drivers who report driving after drinking alcohol (DUIA) are significantly increased, and similarly that the chances of past year collisions among drivers who report driving after cannabis use (DUIC) are also significantly increased. Recently, we examined drivers who reported both DUIA and DUIC (DUIC+A) and found that the past-year collision risk in this group, at 30.5 per cent, was 2-4 times that seen among drivers who reported either behaviour by itself. This DUIA+C group may be an important risk group, and the purpose of this study was to explore factors that might distinguish this group from other drivers. Data were derived from the CAMH Monitor, an ongoing population survey of Ontario adults (18 years and older). Preliminary analyses reveal important differences by age group, with younger drivers being significantly more likely to report DUIA, DUIC and DUIA+C. Drivers who reported any DUIC were also more likely to report DUIA+C than drivers who reported any DUIA. Our analyses provide further confirmation that individuals who fall in this DUIA+C group are an important group from road safety perspectives. Further analyses will consider the potential impact of frequency of substance use, substance related problems, and indicators of mental health problems on the likelihood of an individual being in the DUIA+C group.


  • English

Media Info

  • Pagination: 33-9
  • Monograph Title: 20th International Conference on Alcohol, Drugs and Traffic Safety Conference Proceedings, 25-28 August 2013, Brisbane Convention and Exhibition Centre, Brisbane, Australia

Subject/Index Terms

Filing Info

  • Accession Number: 01495635
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Oct 17 2013 10:10AM