What is a "tread wear indicator"?

A tread wear indicator is a built-in feature found on tires that provides a visual indication of the tire's tread depth. Specifically, it helps drivers recognize when the tire has worn down to an unsafe level for driving. These indicators are usually small raised sections within the tread grooves that become visible as the tire wears. When the tread wears down to the height of the indicators, it signals that the tire has reached a level of tread deterioration where traction and performance may be compromised, thereby enhancing safety on the road.

Understanding the importance of tread wear indicators is crucial for tire maintenance and vehicle safety. They play a significant role in promoting timely tire replacement, thereby preventing accidents caused by inadequate traction on wet or slippery surfaces.