**Stress** and the **mood** of the driver can affect their behavior at the wheel. When a driver is stressed, they are more likely to feel **nervous and irritable**, which can lead to a more **hostile** attitude towards other road users.

- Stress can arise from situations such as heated arguments or receiving bad news before driving. These emotional changes can decrease concentration and increase the likelihood of accidents.
- **Fatigue**, which often accompanies stress, also contributes to irritability. Fatigued drivers experience difficulty concentrating, feel more nervous, and have a greater tendency to react in a hostile manner.

Therefore, stress not only affects concentration ability but can also make a driver more prone to behaving in a hostile manner on the road.