See also:

Wear indicators
1) New tread 2) Worn tread 3) Tread wear indicator Each tire incorporates a tread wear indicator, which becomes visible when the depth of the tread grooves decreases to 0.063 in (1.6 mm). ...

Security indicator light
The security indicator light deters potential thieves by indicating that the vehicle is equipped with an immobilizer system. It begins flashing approximately 60 seconds after the ignition switch ...

Uniform Tire Quality Grading (UTQG)
For details, refer to “Uniform tire quality grading standards”. ...