Alcohol, drugs, medication, and fitness to drive
What this domain tests
This domain tests the legal alcohol limits, zero tolerance for drugs, the effect of medication, and your duty to assess fitness before driving.
Limits and fitness
Luxembourg's general alcohol limit is 0.5 g/L of blood (0.25 mg/L breath). Probationary drivers have a 0.2 g/L limit. Illegal drugs are zero tolerance. Medication can impair driving even when prescribed; check the warning pictogram and the leaflet.
Key checks
- Do not drive if tired, ill, or after taking medicine that causes drowsiness.
- Eyesight must meet the legal standard; wear prescribed glasses or lenses.
- Alcohol is eliminated by time only; coffee, food, or fresh air do not sober you up.
- Police can test breath and saliva; refusing a test has legal consequences.
Worked example
A probationary driver has one small beer and feels fine. Reasoning: the probationary limit is 0.2 g/L, so even a small amount can push them over; the safe choice is not to drive. For a fully licensed driver, one drink may still be under 0.5 g/L, but absorption varies and the risk of a positive test remains.
Traps
Believing the legal limit means safe; ignoring a medication pictogram; assuming sleep cures alcohol; forgetting that a hangover can still impair driving.