**Tires** are a crucial element for the **active safety** of a vehicle, as their condition directly affects the grip and stability of the car on the road.

- Over time, the **rubber of the tires** can harden due to aging. This hardening is dangerous because it reduces the tire's ability to **grip** the road properly.

- The **tread** of the tires, which is the part in contact with the road, must have deep grooves to ensure good grip. These grooves allow the tire to be more flexible and to expel water when it rains, thus preventing slipping.

- When the rubber hardens, it loses flexibility, which can lead to the vehicle **skidding** or sliding, especially under normal driving conditions, not just when the road is wet.

Therefore, it is essential to keep the tires in good condition and replace them when the rubber hardens to prevent accidents due to lack of grip.