Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 245

Active Distance Assist DISTRONIC or Active
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Steering Assist is deactivated.
The vehicle cannot make the lane change as
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planned.
Cancellation of Active Lane Change Assist is dis-
played as follows:
The arrow in the selected direction of travel
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turns red.
A corresponding message appears on the
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driver display.
In certain circumstances a warning tone
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sounds.
& WARNING Risk of accident when changing
lane to an occupied adjacent lane
Lane Change Assist cannot always clearly
detect if the adjacent lane is free.
The lane change might be initiated although
the adjacent lane is not free.
Before changing lanes, make sure that
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the neighbouring lane is free and there is
no danger to other road users.
Monitor the lane change.
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& WARNING Risk of accident if Lane Change
Assist unexpectedly stops functioning
If the system limitations for Lane Change
Assist have been reached, there is no guaran-
tee that the system will remain active.
Lane Change Assist cannot then assist you by
applying steering torque.
Always monitor the lane change and
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keep your hands on the steering wheel.
Observe the traffic conditions and steer
and/or brake if necessary.
System limits
The system may be impaired or may not function
in the following instances:
There is poor visibility, e.g. due to snow, rain,
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fog, heavy spray, greatly varying light condi-
tions or strong shadows on the carriageway.
There is glare, e.g. from oncoming traffic,
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direct sunlight or reflections.
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Driving and parking 243
Due to insufficient illumination of the road, or
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if the exterior lighting indicates a malfunction.
The windscreen is dirty, misted up, damaged
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or covered in the vicinity of the camera, e.g.
by a sticker.
The sensors are damaged, covered or dirty.
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No, or several, unclear lane markings are pres-
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ent for one lane, or the markings change
quickly, for example, in a construction area or
junctions.
The system does not detect a suitable road,
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for example, in tight bends or shortly after a
slip road.
The lane markings are worn away, dark or cov-
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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.
There are obstacles on the lane or projecting
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out into the lane, such as object markers.
When the tyre pressure is too low.
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