The **tires** of a vehicle have a special design on their tread, which is the part that is in contact with the road. This tread has **grooves** that serve several important functions, such as improving grip and removing water when it rains. These grooves are divided into two types of **drainage channels**: **transverse** and **circumferential**.

- **Transverse channels**: These are grooves that cross the tire from one side to the other. They help expel water to the sides, reducing the risk of aquaplaning, which is when the vehicle loses contact with the road due to a layer of water.

- **Circumferential channels**: These are grooves that run along the circumference of the tire. They help channel water towards the transverse channels and also contribute to maintaining grip in rainy conditions.

Therefore, tires are designed with these two types of channels to ensure good performance and safety in different road conditions.