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:
The turn signals will flash when the vehicle is locked or unlocked.
Exterior confirmation
Locking
The turn signals will flash once and the door mirrors will fold in1
to confirm the vehicle is locked.
Unlocking
The turn signals will flash twice and the door mirrors will fold out1 to
confirm the vehicle is unlocked...
(Option/accessory.)
(Depending on market, this function can be either standard or optional.)
Pilot Assist steering assistance can be temporarily deactivated and reactivated
without prior warning.
When the turn signals are used, Pilot Assist's steering assistance will be temporarily
deactivated...