Why do I have TPMS in my Vehicle?

As of 2007, the United States Department of Transportation (through NHTSA) requires a Tire Pressure Monitoring System to all new passenger cars, multipurpose passenger vehicles, trucks, and buses that have a gross vehicle weight rating of 10,000 lbs. or less (except those vehicles with dual wheels on an axle). The legislation requiring TPMS passed in reaction to Congressional hearings on vehicle rollover deaths caused, in part, by vehicles with under inflated tires.