**Fatigue** is a state that negatively affects the driver and is one of the main risks of accidents on the road. It can be either **physical** or **psychological**. Physical fatigue generates a feeling of tiredness, while psychological fatigue makes concentration difficult.

When a driver is fatigued, they experience several **symptoms** that affect their ability to drive safely:

- **Difficulty concentrating** on the road.
- **Impaired vision and hearing**, which may cause them not to perceive the environment well.
- **Slower movements**, meaning their reactions are delayed.
- **Difficulty making quick and appropriate decisions** at the wheel.
- **Increased reaction time** to any danger, which raises the risk of accidents.

Therefore, a fatigued driver **reacts later to any danger**, which justifies this as the correct answer. Fatigue not only affects reaction speed but also the ability to concentrate and make decisions, which can lead to dangerous situations on the road.