The **most frequent accidents** involving motorcycles and mopeds are **head-on or front-lateral collisions with other vehicles**. This mainly occurs when overtaking and is common due to errors by both motorcycle riders and other vehicle drivers.

- **Errors by motorcyclists**: may include occupying the opposite lane or becoming distracted.
- **Errors by other drivers**: not respecting the right of way of motorcycles, occupying the opposite lane, or becoming distracted.

To reduce these accidents, it is crucial that drivers of other vehicles:

- Check for the presence of motorcycles before changing lanes.
- Maintain an adequate safety distance.
- Respect the right of way of motorcycles.

These measures help prevent head-on or front-lateral collisions, which are the most common and dangerous for motorcyclists.