The **rearview mirrors** are essential tools for safe driving, as they allow the driver to see what is happening on the sides and behind the vehicle. This is crucial for making informed decisions when performing maneuvers, such as changing lanes or turning, ensuring there are no vehicles in the **blind spots**.

- **Check objects and vehicles behind:** Rearview mirrors are used to verify which objects and vehicles are behind the vehicle. This helps maintain a safe distance and stay aware of the surrounding traffic.

- **Determine the position of vehicles behind:** They are also useful for determining the position of vehicles traveling behind, which is important for anticipating their movements and avoiding collisions.

However, rearview mirrors **are not used** to check if the **turn signals are working**. Turn signals are lights that are activated to indicate to other drivers that a maneuver is going to be performed. The verification of their operation is done by observing the vehicle's dashboard, where there is usually a light indicator that flashes at the same time as the exterior turn signals.