Tread depth refers to the measurement of the depth of the grooves on a tire's surface. It is an important factor in determining a tire's grip on the road, especially in wet or slippery conditions. A deeper tread depth generally provides better traction, while worn tires with shallow tread can lead to reduced performance and increased risk of hydroplaning. To ensure safety and optimal performance, it is recommended to regularly check the tread depth of your tires. Most tires have indicators, known as tread wear indicators, that show when the tread has worn down to a certain level. Maintaining adequate tread depth is essential for safe driving.