Cannabis and DrivingFrom the Australian Drug Foundation
It is illegal to drive a motor vehicle [in Australia and the UK] while under the influence of any drug (including cannabis). Breaking this law carries heavy penalties, disqualification from driving, fines, and even imprisonment.
Cannabis, particularly in combination with alcohol, will greatly increase the risk of having an accident. Cannabis and alcohol can significantly reduce the ability to drive safely. Effects, such as reduced coordination, slow reaction time, blurred vision and drowsiness, impact on driving ability. These effects can last several hours and appear to vary according to quantity, quality and content. Research on the effects of cannabis on driving is currently being undertaken.