To drive safely on a **curve with reduced visibility**, it is essential to **leave completely free the half of the road corresponding to the opposite direction**. This is due to several reasons:

- **Safety and visibility:** By leaving the half of the road in the opposite direction free, the risk of collisions with vehicles coming from the opposite direction is avoided. This is especially important on curves where visibility is limited and it is not possible to clearly see if a vehicle is approaching.

- **Traffic regulations:** Traffic rules indicate that vehicles must drive on the right and as close as possible to the edge of the road, especially in situations of reduced visibility such as curves and crests. This ensures that each vehicle stays in its lane and does not invade the space of the opposite direction.

- **Curve driving technique:** When taking a curve, it is important to approach the right edge of the road before entering the curve. This helps maintain control of the vehicle and follow a safe trajectory without invading the opposite lane.

By following these guidelines, the risks of accidents are minimized, and safer driving is ensured for all road users.