Alcohol, Drugs and Driver Fitness
The Alcohol, Drugs and Driver Fitness domain tests whether you understand how drink, drugs, illness and fatigue degrade the skills driving depends on, and what the law expects of you. The exam expects a firm answer: the legal limit is a maximum, not a target, and the safe driving choice is not to drive after drinking at all.
What alcohol does
Alcohol slows reaction time, narrows attention, spoils judgement of speed and distance and increases confidence, which is the combination that makes it lethal. Impairment begins well below the legal threshold. The body clears alcohol slowly, roughly one standard drink per hour for many adults, and nothing speeds that up: not coffee, food, cold air or a shower. A heavy night can leave you over the limit the next morning.
Drugs and medicines
Cannabis, cocaine and other drugs impair coordination and judgement, and the effects last long after the high has passed. Prescription and over-the-counter medicines such as antihistamines, sedatives and strong painkillers can cause drowsiness; read the label and ask a pharmacist. If a medicine warns against driving, do not drive.
Fitness
- Fatigue: yawning, drifting, heavy eyelids and missed signs mean stop and rest, or share the driving. A short nap beats loud music.
- Illness and fever slow reactions as much as alcohol does.
- Eyesight must meet the required standard, and prescribed glasses or lenses must be worn every time.
- Declare conditions such as epilepsy, diabetes or heart disease that could cause sudden incapacity.
The legal side
Driving, attempting to drive or being in charge of a vehicle while unfit through drink or drugs is an offence. Refusing to provide a specimen when required is an offence in its own right. Penalties include fines, disqualification and imprisonment.
Worked example
A driver has had two beers over three hours, feels sober and asks whether he can drive home. The correct answer is no. Elimination is slow and unpredictable, impairment is not felt by the impaired driver, and the legal limit is not a safe-driving threshold. The reliable choice is a designated driver, a taxi or simply not drinking.
Traps
Counting drinks rather than weighing up time, body weight and food; believing coffee sobers you up; assuming a prescription medicine is safe because it is legal; and driving while tired because the journey is short.