Volvo XC90: Wheels and tires / Tread wear indicator
The tread wear indicator shows the status of the tire's tread.

The tread wear indicator is a narrow elevated strip running across the tire's
longitudinal tread grooves. The letters TWI (Tread Wear Indicator) are visible on
the side of the tire. When approximately 1.6 mm (1/16 inch) is left on the tread,
the tread will be at the same height as the tread wear indicator. Replace the tire
as soon as possible. Tires with low tread offer very poor traction in rain or snow.
Tires with tread designed to roll in only one direction are marked with an
arrow on the sidewall.
The arrow shows the tire's direction of rotation.
The tire should maintain the same direction of rotation throughout its service
life...
The following is a glossary of tire-related terms.
The tire suppliers may have additional markings, notes or warnings such as standard
load, radial tubeless, etc...
Other information:
When the tire inflation pressure monitoring system1 detects low
inflation pressure in a tire, immediate action is required.
If the system's indicator symbol
illuminates and the message Tire pressure low is displayed, check the tire
pressure and inflate if necessary...
(Option/accessory.)
Android Auto1 lets you listen to music, make calls, get driving directions
and use apps customized for your vehicle from an Android device. Android Auto can
be used with selected Android devices.
For information on supported apps and compatible Android devices, please go to
www...