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Adaptive cruise control (ACC)
FORWARD ALERT
FUNCTION
The system assists you by warning
of the risk of a collision, and reducing
the severity of a collision with a
vehicle in front. This works by using
two methods:
•
You are alerted to a potential
collision so you may brake earlier
than normal.
•
Brake support is activated to
enable full braking effectiveness.
The collision alerts will only occur if
the system is switched on, however
the brake support is always on and
cannot be turned off. Warnings are
both visual and audible. Brake
support is activated automatically if
necessary to reduce the collision
speed. The brake support system
only reduces the collision speed if
you brake immediately once alerted.
WARNINGS
Never wait for a collision
warning. When driving you are
responsible for maintaining the
correct distance and speed, even
when the system is used.
The system will only react to
vehicles in front travelling in the
same direction and will not react to
slow or stationary vehicles.
Never drive in a manner to
provoke the system. The
system is designed to assist in
emergencies only.
The system alerts you by warning
chimes and a visual warning in the
information display. When forward
alert is activated a red flashing
warning triangle is displayed in the
information display.
Note: You can deactivate the
warning chimes by using the buttons
on the steering wheel. See Audible
warnings and indicators (page
84).
The system does not operate in all
driving situations and traffic, weather
and road conditions.
The radar sensor detects vehicles in
front that are driving in the same
direction as you. If the risk of collision
still increases after the initial warning
then brake support is activated.
Brake support prepares the brake
system for rapid braking and the
brakes are applied gently, which may
be noticed as a slight jerk. If the brake
pedal is depressed sufficiently quickly
then braking is implemented with full
brake function, even if the force on
the pedal is light.
CAUTION
Warnings may be triggered late,
be absent or triggered
unnecessarily if the traffic situation
means that the radar sensor cannot
accurately detect a vehicle in front.
The system uses the same radar
sensors as adaptive cruise control
(ACC) and therefore has the same
limitations. See Principle of
operation (page 163).
168
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