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Over one million Brits admit to driving under the influence of drugs, according to a leading motoring charity.

A spokesperson for the Institute of Advanced Motorists (IAM) explained that around 750,000 individuals have driven under the influence of cannabis and 370,000 after taking class A drugs.

"For some years a slightly higher proportion of drivers have admitted to driving under the influence of Class A drugs," she said.

"We believe that the proven ability of impairment testing should not be forgotten in any rush to provide a technological solution to the drug driving issue."

The main role of new drugalysers, if they can't be used to detect cocktails of drugs and alcohol, will be to find out if a motorist has any illegal substances in their system.

Through the increased risk of being caught, British roads should become safer as many more individuals will choose not to risk it. This should reduce the number of car insurance claims from accidents caused by drivers on drugs.

Although there will have to be a far-reaching awareness campaign in order for the public to know about the changes.