6.2.8 Protector purpose
Under ideal conditions, there should be no tread at all (look at the slicks of formula cars) in order to maximize the contact area between the tire and the road surface. However, ideal conditions are when the road is covered with asphalt concrete, moreover, dry one. As soon as even a small layer of liquid appears on the surface or the surface becomes simply wet, the grip* of the tire with the road will drop sharply, contact will be lost and the driver will lose control of the car. In order that when hitting a surface with a layer of water, this very water was where to drain (one might say, forcibly), the tire is replete with a herringbone tread. In case if the tire is intended for driving in winter, then the tread shape will also be appropriate - an increased number of sipes and dirt collectors.
Note
* The force with which the wheels "grab" the road is characterized by the coefficient of adhesion of the tires to the road. The coefficient of adhesion is the ratio of the adhesion force of the wheels to the road to the weight of the given wheel. Coefficient of adhesion with the road is essential when braking and accelerating a vehicle. The higher the coefficient of adhesion of the wheel, the higher will be the intensity of acceleration and braking of the car.
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