The **lack of passenger experience** on a motorcycle can be a cause of accidents, especially in **curves**. This is because two-wheeled vehicles, like motorcycles, are more **fragile** and less visible than other vehicles, which requires careful handling.

- In curves, the passenger's behavior is crucial. If the passenger does not know how to move properly, they can destabilize the motorcycle, increasing the risk of an accident.
- Motorcycle riders already face a higher risk of accidents due to the fragility of their vehicles and the need to be especially careful. The passenger's inexperience can further complicate the situation.

Therefore, it is important that both the rider and the passenger are well-informed and prepared to handle situations like curves safely.