Alcohol, Drugs, Fatigue and Driver Fitness
This domain tests whether you can drive legally and safely given your physical and mental state. Alcohol, drugs, tiredness and poor eyesight all slow reaction, reduce judgement and increase the chance of a collision.
Alcohol and drugs
- Any alcohol can impair; the safest approach is not to drink before driving.
- The legal limit is not a target; impairment begins below it for many people.
- Illegal drugs and some prescription medicines affect alertness and reaction time; read the label and ask a pharmacist.
- Coffee, cold air and a shower do not sober you up; only time removes alcohol.
Fatigue and fitness
- Signs of fatigue include yawning, heavy eyes, poor concentration and drifting.
- Stop somewhere safe, rest or sleep; do not rely on music or open windows.
- Have your eyesight checked regularly and wear prescribed lenses while driving.
- Declare medical conditions that affect driving and follow medical advice.
Worked example
After two drinks, a driver feels 'fine' and drinks strong coffee. The coffee does not lower blood alcohol. Reasoning: the liver removes alcohol at a limited rate; stimulants may mask drowsiness but do not restore judgement or reaction time. The safe choice is not to drive.
Traps that cost marks
- Believing the legal limit means 'safe'.
- Assuming prescription medicine is always safe to drive on.
- Driving tired because the trip is short.
- Relying on coffee, energy drinks or fresh air to sober up.