Alcohol, Drugs and Fatigue Flashcards

What is the legal blood alcohol concentration (BAC) limit for an ordinary driver in South Africa?

Answer: 0.05 grams per 100 millilitres

The legal BAC limit for ordinary drivers in South Africa is 0.05g per 100ml of blood.

What is the legal blood alcohol limit for a professional driver (e.g. taxi or bus driver) in South Africa?

Answer: 0.02 grams per 100 millilitres

Professional drivers face a stricter limit of 0.02g per 100ml blood because they carry passengers and bear greater responsibility.

How does alcohol primarily affect a driver's ability?

Answer: It reduces reaction time and impairs judgement

Alcohol slows reaction time, impairs judgement, reduces coordination, and distorts perception, all of which are critical for safe driving.

Which of the following is a sign that a driver may be too fatigued to drive safely?

Answer: Difficulty keeping eyes open and drifting out of lane

Difficulty keeping eyes open and lane drifting are classic signs of dangerous driver fatigue and a clear indication to stop driving.

What should you do if you feel drowsy while driving on a long trip?

Answer: Stop at a safe place, rest or sleep before continuing

The only safe response to drowsiness is to stop, rest or sleep; other methods are temporary and do not restore alertness adequately.

Can prescription or over-the-counter medication affect your ability to drive safely?

Answer: Yes, many medications cause drowsiness, dizziness or impaired concentration

Many medications — including antihistamines, sedatives and painkillers — can impair driving ability even when taken correctly.

Which of the following best describes the effect of alcohol on a driver's vision?

Answer: Alcohol reduces peripheral vision and impairs depth perception

Alcohol reduces peripheral (side) vision and distorts depth perception, making it harder to judge distances and spot hazards.