The driver of a passenger car is not allowed to use **headphones** while driving. This is because the use of headphones can distract the driver, similar to what happens with the use of a mobile phone. When a driver is distracted, their ability to pay attention to the road decreases, which increases the risk of accidents.

- **Distractions**: Using headphones can cause the driver to pay more attention to what they are listening to than to the road, which can lead to errors such as misjudging distances or missing important traffic signals.

- **Loss of points**: Driving with headphones connected to a mobile phone or another electronic device is an infraction that can result in the loss of points from the driving license. This underscores the seriousness of the offense and its impact on road safety.

In summary, to ensure road safety and avoid distractions, the use of headphones is prohibited when driving a passenger car.