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262 Driving and parking
The system may be impaired or may not function
in the following situations:
If there is poor visibility, e.g. due to insuffi‐
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cient illumination of the road, if there are
highly variable shade conditions or in rain,
snow, fog or heavy spray.
If there is glare, e.g. from oncoming traffic,
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the sun or reflections.
If the windscreen in the area of the multi‐
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function camera is dirty, or if the camera is
misted up, damaged or covered.
If there are no lane markings, or several
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unclear lane markings are present for one
lane, e.g. around roadworks.
If the lane markings are worn, dark or cov‐
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ered.
If the distance to the vehicle in front is too
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short and thus the lane markings cannot be
detected.
If the lane markings change quickly, e.g.
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lanes branch off, cross one another or
merge.
If the carriageway is very narrow and wind‐
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ing.
Vehicles with Driving Assistance package or
Driving Assistance Plus package: Active Lane
Keeping Assist uses radar sensors to monitor
several areas around the vehicle. If the radar
sensors in the rear bumper are dirty or covered
with snow, the system may be impaired or may
not function. If an obstacle in the lane in which
you are driving has been detected, no lane-cor‐
recting brake application occurs.
Activating/deactivating Active Lane Keeping
Assist (vehicles with Parking Assist
PARKTRONIC)
& WARNING Risk of accident despite
Active Lane Keeping Assist warning
A lane-correcting brake application cannot
always bring the vehicle back into the origi‐
nal lane.
Always steer, brake or accelerate your‐
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self, especially if Active Lane Keeping
Assist warns you or makes a lane-cor‐
recting brake application.
& WARNING Risk of accident despite inter‐
vention of Active Lane Keeping Assist
Active Lane Keeping Assist does not detect
traffic conditions or road users. In very rare
cases, the system may make an inappropri‐
ate brake application, e.g. after intentionally
driving over a solid lane marking.
The brake application can be interrupted at
any time if you steer slightly in the opposite
direction.
Always make sure that there is suffi‐
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cient distance to the side for other traf‐
fic or obstacles.
& WARNING Risk of accident despite Lane
Keeping Assist
Lane Keeping Assist cannot always clearly
detect lane markings.
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