DrugsFlanders
An introduction to the traffic rules and road signs of Flanders. Learn about driving, road safety and much more in our illustrated book, with answers to frequently asked questions.
For informational purposes only. Always follow official regulations. Some content and images were created with AI assistance.
255. Drugs
Drugs can seriously affect driving by changing perception, concentration, reaction time, coordination and judgement. Stimulants, cannabis, opioids and other psychoactive substances can each impair driving in different ways, and combining drugs with alcohol or other substances can increase the risk further. The effects may continue even after a person no longer feels intoxicated. Drug-driving laws vary between countries, but drivers should never drive when a substance affects their ability to control the vehicle safely.
Is driving after using drugs illegal in Belgium?
Yes. Belgian law prohibits driving when specified drugs are present at or above the legal concentration thresholds established for saliva or blood analysis.
Which drugs are currently included in Belgian roadside drug controls?
The current system covers THC, amphetamine, MDMA, morphine or 6-acetylmorphine, and cocaine or benzoylecgonine. These substances are detected using saliva testing and confirmed by saliva or blood analysis.
How does a Belgian roadside drug control work?
Police normally use a standardised checklist for signs of recent drug use, followed by a saliva test when indicated. After a positive saliva test, a laboratory saliva analysis is normally used to confirm the offence.

Traffic rules
Flanders