To avoid or delay the onset of **fatigue** while driving, it is essential to keep the interior of the vehicle **well ventilated**. Fatigue can manifest with symptoms such as difficulty concentrating, heaviness in the eyes, and a feeling of pressure in the head. These symptoms can worsen if the environment inside the vehicle is closed and hot.

- **Adequate ventilation**: Keeping fresh air circulating helps keep you alert and comfortable, reducing the likelihood of feeling sleepy or fatigued.

- **Vehicle temperature**: An overly hot environment can increase the feeling of tiredness. Therefore, it is important to avoid high temperatures inside the car.

- **Hydration**: Drinking water or juices also helps keep the body hydrated, which is crucial to prevent fatigue.

In summary, good ventilation and an adequate temperature inside the vehicle are essential to maintain concentration and avoid fatigue while driving.