Volvo XC90 TWIN ENGINE Owner's Manual page 357

Rear Collision Warning
The Rear Collision Warning (RCW) function can
help the driver to avoid being hit by a vehicle
approaching from behind.
RCW is activated automatically each time the
engine is started.
The RCW can warn the driver in a vehicle
approaching from behind that a collision is immi-
nent by rapidly flashing the direction indicators.
If, at a speed below 30 km/h (20 mph), the RCW
function detects that the car is in danger of being
hit from behind, the seatbelt tensioners may ten-
sion the front seatbelts and activate the Whiplash
Protection System safety system.
Immediately before a collision from behind, RCW
may also activate the foot brake in order to
reduce the forward acceleration of the car during
the collision. However, the foot brake is only acti-
vated if the car is stationary. The foot brake relea-
ses immediately if the accelerator pedal is
depressed.
Related information
•
Limitations of Rear Collision Warning
(p. 355)
•
Whiplash Protection System (p. 45)
Limitations of Rear Collision
Warning
In certain cases the RCW may have difficulty
helping the driver in the event of a collision risk.
This can be, for example, if:
•
the vehicle approaching from behind is
detected too late
•
the vehicle approaching from behind
changes lane at the last moment
•
the vehicle approaching from behind has a
speed exceeding 80 km/h (50 mph)
•
a trailer, bicycle rack or similar is connected
to the car's electrical system - the RCW
function is then deactivated automatically.
NOTE
In certain markets, RCW does not give a
warning with the direction indicators due to
local traffic regulations - in such cases, this
part of the function is deactivated.
NOTE
The warning with direction indicators for Rear
Collision Warning is deactivated if the warn-
ing distance for collision warning in the City
Safety function is set at the lowest level
" Late ".
The seat belt pre-tensioning and braking
functions are, however, still active.
DRIVER SUPPORT
Related information
•
Rear Collision Warning (p. 355)
355