How do drugs affect driving performance?
Research shows that a driver who has recently consumed cannabis or an amphetamine-based substance is at the same risk of having a crash as a driver with a BAC above 0.05. THC (an active component of cannabis) impairs mental function and reduces attention and concentration on driving. THC significantly increases crash risk and affects driving even when there are no outward signs of impairment. Methamphetamines (speed), MDMA (ecstasy), cocaine, heroin, ketamine and other drugs along with some prescription medicines, increase risk taking and aggression. Some drivers use drugs to temporarily allow them to continue to drive even though they are too tired to do so safely.
