The occupants of a moped equipped with **seat belts** are required to use them on both **urban and interurban roads**. This is because:

- **All passengers** in a vehicle that has seat belts installed must use them, regardless of whether they are on a highway or a street within a city. There are no exceptions for mopeds in this regard.

- Although there are some exceptions for not using the seat belt, these only apply to certain drivers in specific situations and **never** on highways, expressways, or motorways. Therefore, on interurban roads, the use of the seat belt is mandatory without exceptions.

- Mopeds, like other two or three-wheeled vehicles, are more fragile, and their occupants are at a higher risk of injury in the event of an accident. Therefore, it is crucial to follow all available safety measures, such as using the seat belt when present.

In summary, the regulation is clear that the use of the seat belt is mandatory on **all roads** for the occupants of mopeds that have this device.