Regulations On Tire Pressure
Since September 2007 all new automobiles below 10,000 lb (4,500 kg) in weight sold in the United States are required to incorporate a Tire Pressure Monitoring System (TPMS), which is capable of monitoring all four tires and simultaneously reporting under-inflation of 25 percent of cold placard pressures in any combination of all four tires. TPMS known as Direct TPMS are capable of TREAD Act legislation requiring simultaneous pressure measurement for each tire pressure.
Early TPMS sensors required batteries but the latest TPMS technology eliminates all sensor batteries.
Read more about this topic: Tire-pressure Gauge
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