Under favourable visibility conditions, to avoid the onset of fatigue during prolonged driving, it is best to rest...

A)every three hours.
B)every half hour, at a minimum.
C)every two hours.Correct
The most important rules to avoid having an accident due to drowsiness or fatigue are:
- If we feel tired or drowsy while driving, the most advisable thing is to stop and rest in a suitable place and sleep for about 20 or 30 minutes.
- Rest for 20 to 30 minutes every 2 hours or every 200 kilometres at most.
- Always be alert to the signs and symptoms of drowsiness or fatigue.