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:
(Option/accessory)
The settings for the multifunctional seats can be adjusted using either the
mutifunction control on the side of the seat or the center display. The adjustment
settings are shown in the center display.
Multifunction control, located on the side of the seat cushion...
The App view contains apps that provide access to certain vehicle services.
Swipe the center display screen from right to left1 to access the
App view from the Home view. This view displays downloaded apps (third-party apps)
as well as apps for integrated functions, such as FM radio...