To perform a **U-turn** safely, it is essential to do it in a **suitable place**. This means that the maneuver must be carried out in a location where it does not endanger other drivers or obstruct traffic.

- **Prohibited places for U-turns**: You must not make a U-turn on curves, hill crests, level crossings, tunnels, highways, and expressways, unless there is a place specifically prepared for it. It is also prohibited on one-way roads and in places where overtaking is prohibited, unless a sign indicates otherwise.

- **Conditions for a safe U-turn**: The maneuver should be done with a single turn of the vehicle, without using reverse gear, unless it is absolutely necessary, such as in the case of a street blocked by construction. Additionally, you should not force other drivers to reduce their speed or create dangerous situations.

- **Actions to take if there is no suitable place**: If you cannot find a safe place to make a U-turn, you must continue driving until you find an appropriate spot. It is important to stop on the right shoulder and wait until it is safe to make the turn if conditions are not favorable.

In summary, a U-turn is prohibited when there is no suitable place to perform the maneuver safely and without risks to other road users.