The **high beam lights** or **road lights** are essential for illuminating a long distance in front of the vehicle, especially on roads outside urban areas. These lights are mandatory for all cars and optional for mopeds. In the case of motorcycles, the regulations allow them to have **one or two high beam lights**.

- **One or two lights**: Motorcycles can be equipped with one or two high beam lights. This provides flexibility in the design and configuration of the lights, as long as safety and visibility regulations are met.

- **Use of the lights**: These lights must be used on roads outside towns or cities, especially at night or in poorly lit tunnels, to ensure good visibility and safety while driving.

Therefore, the correct option is that a motorcycle must have **one or two high beam lights**.