What circumstances favour the onset of fatigue?

Poor ventilation or a high temperature inside the vehicle can make driving more uncomfortable and even alter our psychophysical state, increasing, for example, our irritability, fatigue, or causing drowsiness, thereby increasing our reaction time. The most important rules to avoid having an accident due to drowsiness or fatigue are: - If we feel tired or sleepy 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.