Using a **mobile phone** while driving is one of the main causes of distraction and significantly increases the risk of accidents. This is due to several factors:

- **Divided attention**: When using a mobile phone, you pay more attention to the conversation than to the road, which can lead to missing important signals or misjudging distances.
- **Vehicle control**: Holding the phone in your hand or on your shoulder makes it difficult to handle the steering wheel, which can cause you to veer off the road or invade the opposite lane.
- **Disorientation**: Using a mobile phone can cause disorientation and loss of time perception, affecting reaction capacity.

In Spain, it is prohibited to use a mobile phone while driving, although the use of hands-free devices is allowed. However, these are also dangerous because attention is still divided between the conversation and driving.

For these reasons, using a mobile phone is more distracting than observing signals or listening to the radio, as these activities do not require diverting as much attention from the road.