One of the main causes of mortality in traffic accidents involving motorcycles and mopeds is **not wearing a helmet**.

- **Head injuries**: Head injuries are the leading cause of death in two-wheeled vehicle accidents. The helmet is a passive safety element that protects the head and can save lives. In fact, three out of ten people who have an accident on a two-wheeled vehicle survive thanks to wearing a helmet.

- **More severe consequences**: Motorcycle and moped accidents have more severe consequences when the occupants do not wear a helmet. This is because, in the event of a collision, the head is one of the most vulnerable parts of the body.

- **Importance of the helmet**: Wearing a helmet is crucial to reducing the risk of fatal head injuries. It is an essential safety device that can make the difference between life and death in an accident.

Therefore, wearing a helmet is fundamental for the safety of motorcyclists and moped riders.