To ensure there is no vehicle in the **blind spot** of your mirror, it is important to **briefly turn your head** and look through the side windows. Mirrors, even when well-adjusted, cannot show everything happening on the sides of the vehicle, leaving areas that cannot be seen, known as blind spots.

- **Blind spots**: These are areas on the sides of the vehicle that cannot be seen with the mirrors. They are dangerous because you cannot monitor what is happening in those places.

- **Turn your head**: By turning your head and looking through the side windows, you can visually check if there is any vehicle in the blind spot before performing maneuvers such as changing lanes. This is crucial to avoid accidents.


Therefore, turning your head is an essential practice for safe and preventive driving.