Proper tire inflation is important for several reasons. Underinflated tires experience a greater amount of sidewall flexion than properly inflated tires, resulting in decreased fuel economy, sluggish handling, longer stopping distances, increased stress to tire components, and heat build-up that can lead to catastrophic failure of the tire, such as cracking, component separation, or blow-out. These catastrophic failures can cause loss of vehicle control and may result in a crash. This book presents an analysis of the data collected through the Tire Pressure Monitoring System-Special Study (TPMS-SS) as it pertains to the effectiveness of TPMS in promoting proper tire inflation.