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:
Data recorded and calculated by the trip computer can be displayed on the
instrument panel.
This data is stored in a trip computer app. You can choose which information
the instrument panel will display in the app menu.
Open and navigate in the app menu1 using the righthand
steering wheel keypad...
Establish an Internet connection using Wi-Fi through Internet sharing (tethering)
from a phone and get access to the connected services in your vehicle.
Make sure that the phone supports Internet sharing (tethering) and that
the function is activated...