To ensure that the vehicle grips the road well, it is essential to **keep the tires in good condition**, especially regarding the **tread depth**. The minimum recommended depth is **1.6 mm**. This is crucial because:

- **The tire tread** helps channel water away from the contact surface, reducing the risk of **aquaplaning**. Aquaplaning occurs when the tire cannot evacuate all the water from the road, causing the vehicle to lose control and skid.

- A worn tire, with a tread depth of less than 1.6 mm, cannot effectively evacuate water, increasing the risk of skidding, especially in rainy conditions or on wet roads.

- Additionally, skidding can occur in curves if the tires do not grip the road well. This can be caused by tires in poor condition, causing the vehicle to slide and lose control.

Therefore, maintaining the tire tread depth at at least 1.6 mm is essential for safe driving and to avoid dangerous situations such as aquaplaning and skidding.