Alcohol, Drugs and Driver Fitness
Driving requires full attention and coordination, and alcohol, drugs and fatigue all undermine both. Alcohol slows reaction time, impairs judgement of speed and distance, and reduces coordination - even below the legal limit. The safe and lawful approach is simple: if you drink, do not drive. Do not assume coffee, food or a cold shower will sober you up; only time removes alcohol from the body.
Illegal drugs and misuse of prescription or over-the-counter medicines can also make you unfit. Read medicine labels for warnings about driving, and ask a pharmacist if unsure. Fatigue is a serious hazard: symptoms include yawning, heavy eyes, drifting and poor concentration. The only cure is to stop somewhere safe and rest - opening a window or turning up the radio does not work.
Fitness to drive also covers eyesight (you must be able to read a number plate at the required distance), medical conditions that affect driving, and emotional state - driving when angry or distressed is dangerous. If you feel unwell, do not drive.
Traps: questions offer 'cures' for tiredness or drunkenness that are myths. Another trap is the driver who has 'only had one drink' - the correct answer is still not to drive if there is any doubt. Also watch for questions about prescription medicines: they can make you unfit even though they are legal.
Rule of thumb: if you are in any doubt about your fitness - alcohol, drugs, medicine, illness or tiredness - do not drive.