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If you fail to adapt your driving style, Lane Keep-
ing Assist can neither reduce the risk of an acci-
dent nor override the laws of physics. Lane
Keeping Assist cannot take into account the
road, traffic and weather conditions. Lane Keep-
ing Assist is merely an aid. You are responsible
for the distance to the vehicle in front, for vehi-
cle speed, for braking in good time and for stay-
ing in your lane.
The Lane Keeping Assist does not keep the vehi-
cle in the lane.
The system may be impaired or may not function
if:
R
there is poor visibility, e.g. due to insufficient
illumination of the road, or due to snow, rain,
fog or heavy spray
R
there is glare, e.g. from oncoming traffic, the
sun or reflection from other vehicles (e.g. if
the road surface is wet)
R
the windshield is dirty, fogged up, damaged or
covered, for instance by a sticker, in the vicin-
ity of the camera
R
there are no or several unclear lane markings
for one lane, e.g. roadworks
R
the lane markings are worn away, dark or cov-
ered up, e.g. by dirt or snow
R
the distance to the vehicle in front is too short
and thus the lane markings cannot be detec-
ted
R
the lane markings change quickly, e.g. lanes
branch off, cross one another or merge
R
the road is narrow and winding
R
there are strong shadows cast on the road
Switching on Lane Keeping Assist
X
Activate Lane Keeping Assist using the on-
board computer; to do so, select StandardStandard or
AdaptiveAdaptive (Y page 169).
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected,
the lines in the Assistance display are shown
in green (Y page 167). Lane Keeping Assist is
ready for use.
Standard
When StandardStandard is selected, no warning vibra-
tion occurs if:
R
you have switched on the turn signal. In this
event, the warnings are suppressed for a cer-
tain period of time
R
a driving safety system intervenes, such as
ABS, BAS or ESP
®
Adaptive
When AdaptiveAdaptive is selected, no warning vibra-
tion occurs if:
R
you have switched on the turn signal. In this
event, the warnings are suppressed for a cer-
tain period of time
R
a driving safety system intervenes, e.g. ABS,
BAS or ESP
®
R
you accelerate hard, e.g. kickdown.
R
you brake hard
R
you steer actively, e.g. swerve to avoid an
obstacle or change lanes quickly
R
you cut the corner on a sharp bend
In order that you are warned only when neces-
sary and in good time if you cross the lane mark-
ing, the system detects certain conditions and
warns you accordingly.
The warning vibration occurs earlier if:
R
you approach the outer lane marking on a
bend
R
the road has very wide lanes, e.g. a freeway
R
the system detects solid lane markings
The warning vibration occurs later if:
R
the road has narrow lanes
R
you cut the corner on a bend
158
Driving systems
Driving and parking
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