**Stress** is a factor that can negatively affect the driver's condition. One of the main consequences of stress is that it **promotes tiredness and fatigue**.

- **Fatigue** can be both physical and psychological. Physical fatigue produces a feeling of **tiredness**, while psychological fatigue makes **concentration** difficult.
- Symptoms of fatigue include difficulty concentrating, heaviness in the eyes, slower movements, and a general feeling of **nervousness and irritability**. These symptoms are clear signs that stress is affecting the driver, increasing the risk of accidents.

Therefore, stress not only causes tiredness but can also lead to a series of symptoms that affect the ability to drive safely.