Drink-drivers are being taught about the dangers of getting behind the wheel after taking drugs.

The drug-driving education has been added to existing rehabilitation courses for motorists convicted of getting behind the wheel while over the alcohol limit as part of a trial in England and Wales.

The Department for Transport (DfT) said around 1,000 offenders will attend the combined courses, which were introduced after figures showed a fifth of convicted drug-drivers had previously been banned for drink-driving.

Road safety minister Andrew Jones said: "We have some of the safest roads in the world and have introduced tougher penalties for drink and drug-driving to make them even safer.

"Getting behind the wheel while under the influence of drugs can have catastrophic results, for drivers and passengers and can ruin families' lives.

"Educating offenders of the dangers of drug-driving will help prevent it in the future."

Rob Manfield, outgoing chairman of the Association of Drink Drive Approved Providers of Training, said: "This pilot provides a great opportunity to intervene and educate drink-drivers, so when they get their licence back they will have a much greater knowledge of the risks both drink and drugs pose to themselves and other road users."

Since the introduction of new rules around drug-driving in March 2015, around 7,000 drivers have been banned compared to 879 in 2014, according to the DfT.

Rehabilitation courses allow first-time offenders to be educated about the impacts of drink-driving on themselves and other road users. Drivers are often given the option of attending a course in return for a lesser fine and shorter ban.

The drug-driving scheme will run until the end of March 2017 and the results will form the basis of a consultation to make these rehabilitation courses available for drug-drivers.

Steve Gooding, director of motoring research charity the RAC Foundation, said: "Historically, police have found it difficult to determine whether people are under the influence of drugs whilst driving, but with around one in 12 adults taking illegal drugs each year - rising to one in five for those under 25 - it is likely to be a significant factor in death and injury on the roads.

"It is also known that drink and drugs are often found together. The question is whether an educational course will be enough to alert offenders to the risks they are taking and change their behaviour."