Drug-drive tests back clampdown
Ashley Gardiner, transport reporter
08dec04
DRIVERS who have recently smoked cannabis tend to veer into the path of other traffic.
This potentially deadly impact of drug-driving was determined during research at Swinburne University.
Researchers gave volunteers legally-sanctioned doses to test the effects of illicit drugs on driving ability.
The findings come as police prepare to start Victoria's world-first random roadside saliva testing for cannabis and methamphetamines next Monday.
A separate series of tests were performed to determine the accuracy of the saliva testing devices police will use.
About 40 volunteers smoked cannabis cigarettes before attempting to drive in a simulator, drugs and driving research unit co-ordinator Katherine Papafotiou said.
"We saw impairment in maintaining a steady position within traffic lanes," Dr Papafotiou told the Herald Sun.
Regular cannabis users were found to have higher levels of THC, the active component of cannabis, in their system.
But this did not necessarily mean regular smokers had lower ability behind the wheel.
"In this particular project, non-regular users performed worse," Dr Papafotiou said. "We did find more errors the higher the dose of cigarette that was smoked."
In another test to determine the effects of amphetamines, volunteers were found to:
WRONGLY use indicators, not use them or leave them on after turning.
FAIL to stop at red lights.
HAVE slower reactions to emergency situations.
Dr Papafotiou said the effects of amphetamines were greater during
the day.
"We attribute that to amphetamines inducing tunnel vision," she said.
"Individuals focus their attention on one particular aspect of the visual field, while ignoring objects to the left or right."
Volunteers, who are paid to be in the laboratory for up to six hours, must have used the drugs before.
Those interested in being a volunteer should call 9214 5341.
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