What is a key indicator of tire wear that must be checked during inspection?

Tread depth is a key indicator of tire wear that must be checked during inspection because it directly affects vehicle safety and performance. Tires with adequate tread depth provide better traction, handling, and braking capabilities, especially in wet or slippery conditions. Insufficient tread depth can lead to hydroplaning and increased stopping distances, significantly elevating the risk of accidents.

Regulatory standards typically dictate minimum tread depths to ensure that tires are safe for use on public roads. During an inspection, measuring the tread depth helps determine if the tires are still within safe limits or if they need to be replaced. Thus, observing tread depth is essential not just for the vehicle's operability, but also for the safety of the driver and passengers.

In contrast, while color fading or sidewall designs might provide some visual clues about the tire's age or condition, they are not direct indicators of performance relevant to tire safety. The brand of tire, although possibly linked to quality, does not provide a measurable assessment of wear and safety.