See also:

Warning/indicator lights
...

Uniform tire quality grading
DOT (Department Of Transportation) Quality Grades: All passenger car tires must conform to federal safety requirements in addition to these grades. Quality grades can be found where applicable ...

Safety note
WARNING • Do not disassemble or modify this system. If you do, it may result in accidents, fire, or electric shock. • Do not use this system if you notice any abnormality, such as a frozen s ...