. Research

Cannabis and driving

The influence of cannabis on driving
Prepared for Road Safety Division, Department of the Environment, Transport and the Regions
B F Sexton, R J Tunbridge, N Brook-Carter (TRL Limited), P G Jackson (DETR),
K Wright (University of Birmingham), M M Stark (St George's Hospital
Medical School) and K Englehart (Principal Police Surgeon)

Recreational Drugs and Driving Prevalence Survey:
Dave Ingram, Becki Lancaster and Steven Hope
Development Department Research Programme
Research Findings No. 102
System Three Social Research
Qualitative Study: Joanne Neale, Neil McKeganey, Gordon Hay
Centre for Drug Misuse Research, University of Glasgow
John Oliver Department of Forensic Medicine, University of Glasgow

Cannabis intoxication and fatal road crashes in France: population based case-control study
Bernard Laumon, Blandine Gadegbeku, Jean-Louis Martin, Marie-Berthe Biecheler
British Medical Journal  2005;331:1371
10th December 2005

Marijuana And Actual Driving Performance
Conducted on behalf of: U.S. Department of Transportation,
National Highway Traffic Safety Administration
(DOT HS 808 078), Final Report, November 1993
HWJ Robbe Institute for Human Psychopharmacology,
University of Maastricht, P.O. Box 616, NL-6200 MD,<
Maastricht, The Netherlands

Cannabis and road safety:
Dr G.B. Chesher
Department of Pharmacology University of Sydney and National Drug and Alcohol Research Centre University of New South Wales.
An outline of research studies to examine the effects of cannabis on driving skills and actual driving performance

Drugs and Accident Risk in Fatally-Injured Drivers
Olaf H. Drummer, Ph.D.
Victorian Institute of Forensic Pathology, Department of Forensic Medicine, Monash University,
57-83 Kavanagh Street, South Melbourne 3205, Australia

Drugs and Driving
Alcohol and Drugs Foundation of Australia

Cannabis and driving - more evidence
Australian Press reports

The AGE 21 October 1998 pA5
CANBERRA TIMES 21 October 1998 p4

The largest study ever done linking road accidents with drugs and alcohol has found drivers with cannabis in their blood were no more at risk than those who were drug-free. In fact, the findings by a pharmacology team from the University of Adelaide and Transport SA showed drivers who had smoked marijuana were marginally less likely to have an accident than those who were drug-free.

A study spokesman, Dr Jason White, said the difference was not great enough to be statistically significant but could be explained by anecdotal evidence that marijuana smokers were more cautious and drove more slowly because of altered time perception.

The study of 2,500 accidents, which matched the blood alcohol levels of injured drivers with details from police reports, found drug-free drivers caused the accidents in 53.5 per cent of cases. Injured drivers with a blood-alcohol concentration of more than 0.05 per cent were culpable in nearly 90 per cent of accidents they were involved in.

Drivers with cannabis in their blood were less likely to cause an accident, with a culpability rate of 50.6 per cent. The study has policy implications for those who argue drug detection should be anew focus for road safety. Dr White said the study showed the importance of concentrating efforts on alcohol rather than other drugs.