When overtaking another vehicle, it is **not mandatory** for vehicles coming in the opposite direction to cooperate, but it is **recommended**. This is because, although they are not legally obliged to do so, their cooperation can facilitate the overtaking maneuver and increase road safety.

- **Facilitating the maneuver**: Drivers coming in the opposite direction can help the overtaking driver by reducing their speed or moving slightly towards the edge of their lane, as long as it is safe to do so. This is not a legal requirement, but it can make overtaking safer and smoother.

- **Safety**: The cooperation of vehicles in the opposite direction can be crucial in situations where space is limited or road conditions are complicated. By facilitating overtaking, the risk of accidents is reduced.

- **Recommendation**: Although it is not mandatory, it is recommended that all drivers be aware of the maneuvers of others and cooperate when possible to improve road safety.

In summary, while the cooperation of vehicles in the opposite direction is not an obligation, it is a recommended practice that contributes to traffic safety and efficiency.