Recognize the Light. Don't Ignore It

In theory, a TPMS is a feature that helps drivers understand the safety of their cars. But it's only effective if drivers can identify the light and are still vigilant about checking their tire pressures. A 2014 study by Schrader International, a company that manufactures TPMS systems, found that 42 percent of drivers are unable to identify the low tire-pressure warning light on the instrument cluster. Roughly the same percentage of those polled admitted to rarely checking the tire pressure.

For those who do recognize the TPMS light, 21 percent said that when they stop to check the low tire, they only give it a visual inspection rather than using a tire pressure gauge, the study said. Worse yet, roughly 10 percent admitted to ignoring the light altogether.

People who rely on the TPMS to warn them about low pressure are taking chances. A tire that's underinflated by just 5 psi can potentially fail. An underinflated tire flexes more than a properly inflated tire, and that creates heat. Excessive heat can break down components and chemical bonds inside a tire. It's much like bending a wire coat hanger: Bend it far enough and long enough, and it will heat up and snap. It's especially important to be vigilant about tire pressure when the weather is hot and vehicle speeds are high.

In addition to being a safety hazard, low tire pressure decreases fuel economy and causes tires to wear out more quickly. These are all reasons to be vigilant about checking tire pressure at least monthly and to not rely on a TPMS to do the job.