Volvo XC90: Lighting / Hazard warning flashers
Hazard warning flashers warn other road users by all of the vehicle's turn
signals being activated at the same time. The function can be used to warn about
a traffic hazard.

Hazard warning flashers button.
Press the button to activate the hazard warning flashers.
NOTE
Regulations concerning the use of hazard warning flashers may vary from
country to country.
The brake lights are automatically illuminated when braking.
The brake lights are illuminated when the brake pedal is depressed and when the
brakes are automatically applied by a driver support system...
Some of the exterior lights remain on to illuminate the area around the vehicle.
This is called home safe lighting.
To activate home safe lighting:
Switch off the ignition...
Other information:
(Option/accessory.)
(Warning of collision from the rear.)
In some situations, it may be difficult for Rear Collision Warning (RCW) to
warn the driver of a collision risk.
This may be the case if:
the vehicle approaching from the rear is detected at a late stage
the vehicle approaching from the rear changes lanes at a late stage
a trailer, bicycle holder or similar is connected to the vehicle'..
The load anchoring eyelets in the cargo compartment can be used to secure
objects with straps, a net, etc.
WARNING
Hard, sharp and/or heavy objects in or protruding from the vehicle can
cause injury in the event of hard braking.
Always secure large and heavy objects with a seat belt or cargo retaining
straps...