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:
Settings for how the vehicle confirms locking and unlocking can be adjusted
in the center display's Settings menu.
To change the locking response settings:
Tap Settings in the center display's Top view.
Tap My Car Locking.
Tap Visible Locking Feedback to select when the vehicle should provide
a visible response:
Lock
Unlock
Both
Or turn off the function by marking Off ...
(Option/accessory.)
(Warning of collision from the rear.)
The Rear Collision Warning1 (RCW) function can help the driver
avoid rear-end collisions from vehicles approaching from behind.
The function can alert drivers of following vehicles of the risk of a collision
by rapidly flashing the turn signals...