**Fatigue** is a state that negatively affects the driver, as it can be both physical and psychological. When a driver is fatigued, they experience several symptoms that impact their ability to drive safely.

- **Physical fatigue**: Produces a feeling of tiredness that can make movements slower.
- **Psychological fatigue**: Makes it difficult to concentrate, which is crucial for driving.

Among the most common symptoms of fatigue are:

- **Difficulty concentrating** on the road.
- **Slower and clumsier movements**.
- **Taking longer to react** to situations on the road.

**Drowsiness**, which often accompanies fatigue, also causes the driver to take longer to react and have problems making quick and effective decisions.

Therefore, a fatigued driver **takes longer to react**, which increases the risk of accidents on the road.