What are indicators of a worn-out tire?

The correct choice highlights key indicators of a worn-out tire, which include cracks, low tread depth, and noticeable vibration while driving. These signs are critical for assessing tire condition and safety.

Cracks on the tire surface can indicate deterioration due to age, exposure to harsh weather conditions, or improper maintenance. Low tread depth is a crucial factor because insufficient tread can significantly reduce traction, especially in wet conditions, increasing the risk of hydroplaning. Noticing vibrations while driving can suggest that the tire is out of balance or that there may be other issues, such as uneven wear, which could compromise the tire's performance and lead to a potential blowout.

In contrast, an excessively shiny surface might be related to a tire that has been overly polished or has excessive wear, but it is not a primary indicator compared to the others listed. Increased noise levels could be a factor of tire wear, yet it alone does not provide a comprehensive picture of tire safety. Uneven air pressure is important for tire maintenance but is not a direct indicator of tire wear itself.