In rainy days, the friction of road surface will become smaller, and the braking distance will also increase than usual. Some drivers deliberately let off part of the air in their tires, or wait until the rain has passed before filling up the tires that are already obviously depressurized.
The test results prove that this is wrong. When the tire pressure decreases, the tire will deform and the braking distance will be longer than that of a vehicle with normal tire pressure. When a car brakes, the tire needs enough pressure to drain the rainwater from the road, so that the car can stop in balance. When the tire pressure decreases, the contact area between the tire and the ground may increase slightly, and the friction coefficient will only increase limited. But with the increase of tire contact area, the pressure per unit area decreases, and the ability of tire to drain rainwater from the ground decreases at the same time, even forms a floating state, which makes the automobile tire slip.
When a highway is running in the rain, a water film will form between the tire and the ground. When the speed of the car is over 80 kilometers per hour, the water film will completely separate the tire from the ground. The tire does not touch the ground at all, but glides on the water like a motor boat. At the beginning of the light rain, the dust and sand on the pavement have not been washed out, which greatly reduces the adhesion of the pavement. If the tire continues to maintain abnormal low pressure, it will be more likely to slip, tail flick, resulting in potential safety hazards.
The Tyre Safety Monitor will execute a self-inspection procedure for four tires at the start of the vehicle and a real-time detection procedure during the driving of the vehicle. Each tire is equipped with a stainless steel nozzle with a sensor, which sends the information to the nearest receiving wire, which then transmits the information to the receiver. Drivers can observe the temperature and air pressure of four tires at any time through the LCD screen installed near the instrument stand. When the tire pressure is less than 25% of the standard tire pressure, the tire safety detector will automatically alarm in the form of sound and light to eliminate the potential safety hazards caused by the tire pressure.