The Tire Pressure Monitoring System (TPMS) tracks the amount of pressure in tires and alerts a driver when the pressure is at an insufficient level. There are two types of tire pressure monitoring systems—direct and indirect. A direct TPMS receives information from pressure sensors inside each tire on the vehicle, while an indirect TPMS uses speed sensor data from the wheels to determine tire pressure levels. When a tire has an insufficient level of pressure, it becomes a safety hazard for various reasons. If pressure is too high, tires tend to bounce and lose traction. If pressure is too low, tires heat up quickly and wear out easily. Heat can negatively affect the tread of a tire and ultimately lead to blowouts and accidents. We recommend that drivers pay attention to the Tire Pressure Monitoring System and heed any warnings it produces.