See also:

Security indicator light
This indicator light shows the status of the alarm system. It also indicates operation of the immobilizer system. ...

Example of accident in which the driver’s/driver’s and front passenger’s SRS frontal airbag(s) will most likely deploy.
A head-on collision against a thick concrete wall at a vehicle speed of 12 to 19 mph (20 to 30 km/h) or higher activates only the driver’s SRS frontal airbag or both driver’s and front passenger’s S ...

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). A tire ...