Cannabis Causes Motor Accidents

Driving under the influence of cannabis was associated with a significantly increased risk of motor vehicle collisions compared to unimpaired driving.

The cannabis use is especially associated with fatal collisions.

Cannabis impairs performance of the cognitive and motor tasks necessary for safe driving therefore increasing the risk of collision.

Young drivers under the influence of cannabis surpassed rates of drinking alcohol and driving.

The higher the THC of cannabis used – the higher the risk of collision.

Data for fatal collisions show an increasing presence of drugs other than alcohol used in conjunction with cannabis.

(Source: British Medical Journal published 9 February 2012)


This timely medical study shows the impact of drug driving and its costs.

The new hydroponically produced cannabis with its higher THC content mean that the risks are increasing.

Many times the victims of the collision with drug impaired drivers are pedestrians, other motorists and their families.

When cannabis and other illicit drug impaired drivers are identified, they should be diverted into drug rehabilitation before they are involved in a fatal road accident.

Warnings to drug impaired drivers do not lead to rehabilitation and the ceasing of drug use so the risks continue.