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232 Driving and parking
If the system detects that the driver has not
steered the vehicle for a considerable period of
time or has removed their hands from the steering
wheel, display
1
appears. If the driver still does
not steer the vehicle, a warning tone sounds in
addition to the visual warning message.
If the driver does not react to the warning for a
considerable period, the system can initiate an
emergency stop (
page 233).
/
The warning is not issued or is stopped when the
driver gives confirmation to the system:
The driver steers the vehicle.
R
Depending on the country: the driver presses
R
a steering wheel button or operates Touch
Control
If Active Steering Assist detects that a system
limit has been reached, a visual warning is issued
and a warning tone sounds.
Observe the notes on driving systems and your
responsibility; you may otherwise fail to recognize
dangers (
page 211).
/
System limits
Active Steering Assist has a limited steering tor-
que for lateral guidance. In some cases, the steer-
ing intervention is not sufficient to keep the vehi-
cle in the lane or to drive through exits.
The system may be impaired or may not function
in the following instances:
There is poor visibility, e.g. due to snow, rain,
R
fog, heavy spray, greatly varying ambient light
or strong shadows on the road.
There is glare, e.g. from oncoming traffic,
R
direct sunlight or reflections.
Insufficient road illumination.
R
The windshield is dirty, fogged up, damaged or
R
covered in the vicinity of the camera, e.g. by a
sticker.
No, or several, unclear lane markings are pres-
R
ent for one lane, or the markings change
quickly, forexample, in a construction area or
intersections.
The lane markings are worn away, dark or cov-
R
ered up, e.g. by dirt or snow.
If the distance to the vehicle in front is too
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short and thus the lane markings cannot be
detected.
The road is narrow and winding.
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There are obstacles on the lane or projecting
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out into the lane, suchas object markers.
The system does not provide assistance in the fol-
lowing conditions:
On tight bends and when turning.
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When crossing intersections.
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At traffic circles or toll stations.
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When towing a trailer.
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When the tire pressure is too low.
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