The **lack of attention** of the driver can be caused by several factors, and one of the most important is an **excessively complex traffic situation**.

- When traffic is very complicated, the driver needs to pay more attention to multiple elements at the same time, such as other vehicles, traffic signals, and pedestrians. This can lead to an **information overload**, making it difficult to maintain concentration.

- **Psychological fatigue** is a factor that affects the driver's ability to concentrate. In complex traffic situations, the mental effort required to process all the information can increase psychological fatigue, further reducing attention.

- Additionally, **physical fatigue** can also have an influence, as physical tiredness can make the driver feel exhausted, affecting their ability to react appropriately in complicated situations.

Therefore, an excessively complex traffic situation is a factor that promotes the driver's lack of attention, as it increases both psychological and physical fatigue, making it difficult to maintain the concentration necessary to drive safely.