Almost one in 10 young drivers believes it is acceptable to drive under the influence of drugs such as cannabis, according to a survey.
The Transport for London (TfL) poll revealed that 9% of 17-25 year olds in the capital considered drug-driving to be safe.
The survey comes as TfL launches a campaign aimed at young drivers who speed, drive without insurance or drive under the influence of drugs.
In 2007, there were 555 collisions in London involving drivers aged 17-25 that resulted in a death or serious injury. The highest numbers of these young-driver collisions occurred in the boroughs of Bromley (34), Greenwich (33) and Havering (28).
Chris Lines, head of TfL's road safety unit, said: "It seems that some young drivers wrongly believe that using drugs will have no effect on their ability to drive. This couldn't be further from the truth.
"Drivers throughout the capital should be aware that the police are now trained to test for drug impairment and that the penalties are just as serious as those for drink-driving."
A separate study in 2007 found that 63% of those that admitted to driving after taking drugs also said they had carried passengers.
Over half of these admitted that their driving had been impaired, while 10% believed that taking drugs, often cannabis, improved their driving.
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