Alcohol, drugs, fatigue and fitness to ride
What this domain tests
Fitness to ride: alcohol and drugs, medicines, fatigue, illness, heat and emotion.
Alcohol and drugs
Saudi law prohibits alcohol, and riding under its influence - or under drugs, including some prescription medicines - is among the most serious traffic offences, carrying heavy fines, detention, licence withdrawal and, for expatriates, deportation and loss of residency. There is no safe 'one drink' threshold to reason about. Many common medicines (strong painkillers, some antihistamines, sedatives, cough syrups) cause drowsiness: read the label, ask the pharmacist, and do not ride if affected.
Fatigue
Fatigue produces the same failures as alcohol: slower reactions, poor lane position, microsleeps of several seconds at highway speed. Warning signs include yawning, heavy eyes, drifting, missing a sign or exit, and irritability. Countermeasures that work: stop, get off the bike, drink water, take a short nap, or end the trip. Fresh air, loud music and coffee only postpone the problem.
Heat, illness and emotion
Riding in 45 °C heat in protective gear causes dehydration, which cuts concentration before you feel thirsty. Carry water and take breaks. Do not ride when feverish, after a head injury, or when angry - adrenaline and risk-taking travel together.
Worked example
A rider has had four hours' sleep before a 600 km desert trip and starts yawning at the 200 km mark. The correct action is to stop for a proper rest, not to open the visor and push on. The hazard here is the rider's own state - the one hazard you can always remove.
Traps
Believing coffee overcomes fatigue; assuming a legal prescription makes riding safe; and relying on 'it is only a short way' - many fatigue crashes happen close to home, at the end of a long day.