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07 Driver support
07
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* Option/accessory, for more information, see Introduction.
235
WARNING
Warnings and brake interventions could be
implemented late or not at all if the traffic
situation or external influences mean that
the radar or camera sensor cannot detect
a pedestrian, a vehicle or a cyclist in front
correctly.
The sensor system has a limited range for
pedestrians and cyclists
23
- the system
can provide effective warnings and brake
interventions for them at vehicle speeds up
to 50 km/h. For stationary or slow-moving
vehicles, warnings and brake interventions
are effective at vehicle speeds up to
70 km/h.
Warnings for stationary or slow-moving
vehicles could be disengaged due to dark-
ness or poor visibility.
Warnings and brake interventions for
pedestrians and cyclists are deactivated at
vehicle speeds exceeding 80 km/h.
The collision warning system uses the same
radar sensors as the Adaptive cruise control
(p. 204). Read more about radar sensor limi-
tations (p. 214).
If warnings are perceived as being too fre-
quent or disturbing then the warning distance
can be reduced (p. 233). This would lead to
the system warning at a later stage, which
reduces the total number of warnings.
Collision Warning with Auto Brake is tempo-
rarily deactivated with reverse gear engaged.
Collision Warning with Auto Brake is not acti-
vated at low speeds - under 4 km/h, which is
why the system does not intervene in situa-
tions where the car is approaching a vehicle
in front very slowly, e.g. when parking.
In situations where the driver demonstrates
active, aware driving behaviour, a collision
warning may be postponed slightly in order to
keep unnecessary warnings to a minimum.
When Auto Brake has prevented a collision
with a stationary object the car remains sta-
tionary for a maximum of 1.5 seconds. If the
car is braked for a vehicle in front that is mov-
ing, then speed is reduced to the same speed
as that maintained by the vehicle in front.
On a car with manual gearbox the engine
stops when Auto Brake has stopped the car,
unless the driver manages to depress the
clutch pedal beforehand.
Related information
•
Collision warning system* (p. 229)
Collision warning system* - camera
sensor limitations
"Collision Warning with Auto Brake and
Cyclist and Pedestrian Detection" is an aid to
assist the driver when there is a risk of collid-
ing with a pedestrian, bicycle or vehicle in
front that are stationary or moving in the same
direction.
The function uses the car's camera sensor,
which has certain limitations.
The car’s camera sensor is also used - as
well as by Collision Warning with Auto Brake
- by the functions:
•
Active main beam (p. 93)
•
Road sign information (p. 195)
•
Driver Alert Control - DAC (p. 239)
•
Lane assistance (p. 242)
NOTE
Keep the windscreen surface in front of the
camera sensor free from ice, snow, mist
and dirt.
Do not stick or attach anything to the
windscreen in front of the camera sensor
as this may reduce effectiveness or cause
one or more of the systems dependent on
the camera to stop working.
23
For cyclists, the warning and full brake intervention may come very late or simultaneously.
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