To drive in reverse, it is important to understand that **it is prohibited to do so on any road or path**, except in specific situations. These situations are:

- **When parking the vehicle**.
- **When it is not possible to move forward or change direction**, such as on a street blocked by construction.

In these exceptional cases, driving in reverse is allowed, but only for the **minimum necessary distance**. This means you must limit the distance to the minimum required to resolve the situation, not exceeding 15 meters. Additionally, you cannot enter an intersection of roads or paths while driving in reverse.

It is crucial to perform this maneuver at **very low speed** and ensure there is no danger to other drivers or pedestrians. You must be prepared to stop immediately if any risk situation arises, such as the approach of another vehicle or the presence of people or animals.

Therefore, the correct answer is that only the **minimum necessary distance** is allowed when driving in reverse in these exceptional situations.