Rear Collision Warning - Volvo XC 90 Owner's Manual

Rear Collision Warning

The Rear Collision Warning (RCW) function can
help the driver to avoid being hit by a vehicle
approaching from behind.
RCW activates automatically whenever the
engine is started and it cannot be switched off.
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 with a vehicle speed under approx. 30 km/h
the RCW function detects that the driver's vehicle
is in danger of being hit from behind, the seatbelt
tensioners may tension the front seatbelts and
the Whiplash Protection System safety system is
activated.
Immediately before the collision, RCW may also
activate the foot brake in order to reduce the for-
ward acceleration of the driver's vehicle during
the collision. However, this can only happen if the
driver's vehicle is stationary. The foot brake relea-
ses immediately if the accelerator pedal is
depressed.
Limitations
In certain cases the RCW may have difficulty
helping the driver in the event of a collision risk.
This can be for example:
•
in slippery conditions when the Electronic
stability control intervenes
•
if the vehicle approaching from the rear is
detected too late
•
if the vehicle approaching from the rear
changes lane at the last moment
•
if the vehicle approaching from the rear has a
speed exceeding approx. 80 km/h.
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
Warning with the direction indicators for Rear
Collision Warning deactivates if the warning
distance for collision warning is set to the
lowest level " Later " (see section "Set warn-
ing distance for City Safety").
The seat belt pre-tensioning and braking
functions are, however, still active.
DRIVER SUPPORT
Related information
•
City Safety (p. 302)
•
Setting the warning distance for City Safety
(p. 305)
•
Seatbelt tensioner (p. 61)
•
Whiplash Protection System (p. 59)
311