Is it safe to drive after taking CBD?

Does pure CBD impair driving?

In an on-road study in the Netherlands, vaporized CBD-dominant cannabis didn’t impair the ability to stay in lane. In Australia, volunteers who swallowed 15, 300 or 1500 mg of pure CBD showed no impairment on simulated driving or attention tests, and no one felt intoxicated. Still, the researchers note that a small effect on some measures couldn’t be ruled out completely.

Sleepiness and attention

The European leaflet for the approved CBD medicine states that, because of sleepiness and sedation, the medicine can have a major effect on the ability to drive and use machines. Patients are told not to drive until they know how the medicine affects them. In university students who took 300 mg of pure CBD, lapses in attention lasted slightly longer. Alcohol and sleep medicines can increase sleepiness.

Products containing THC

THC clearly impairs driving. In the Dutch study, cannabis containing THC impaired the ability to stay in lane 40–100 minutes after use; adding the same amount of CBD didn’t prevent this impairment. According to an analysis combining eighty publications, after vaporized THC most skills recover in about 5 hours and nearly all in about 7 hours; with swallowed THC, this takes longer. According to a review of THC products taken by mouth, the effects can last up to 8 hours.

Roadside tests

Two widely used saliva test devices gave no positive results in volunteers who swallowed pure CBD. But with CBD oils containing small amounts of THC, positive results could occur both in saliva (by lab measurement) and on urine tests. A test can come back positive even if the person doesn’t feel affected.

The law in Turkey

Under the Karayolları Trafik Kanunu (Highway Traffic Law), drivers who have taken narcotic or stimulant substances are banned from driving. Police use test kits for this; people who dispute the result give a blood, saliva or urine sample. Under an amendment in February 2026, a driver found to have taken these substances gets a heavy administrative fine, their license is canceled, and at least five years must pass before they can start driver training again. If you use a product that may contain THC, keep this risk in mind.

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