Mercedes-Benz S-Class 2020 Owner's Manual page 252

the driver still does not steer the vehicle, or
gives no confirmation to the system, a warning
tone sounds in addition to the visual warning
message.
If the driver does not react to this warning for a
considerable period, an emergency stop is initi‐
ated ( page 250).
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The warning is not issued or is stopped as soon
as the system detects that the driver has
touched the steering wheel.
Touch detection may be limited or inoperative in
the following situations:
The driver is wearing gloves.
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There is a steering wheel cover on the steer‐
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ing wheel.
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 recog‐
nise dangers ( page 230).
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System limits
Active Steering Assist has a limited steering tor‐
que for lateral guidance. In some cases, the
steering intervention is not sufficient to keep the
vehicle in the lane.
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.
Insufficient road illumination.
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The windscreen is dirty, misted up, damaged
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or covered in the vicinity of the camera, e.g.
by a sticker.
No, or several, unclear lane markings are
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present for one lane, or the markings change
quickly, for example, in a construction area
or junctions.
The lane markings are worn away, dark or
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covered up, e.g. by dirt or snow.
Driving and parking 249
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, such as object markers.
If transport equipment, for example a trailer
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or bicycle rack, is attached to the trailer
hitch and the electrical connection has been
correctly established.
The system does not provide assistance in the
following conditions:
On very tight bends and when turning.
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When crossing junctions.
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At roundabouts or toll stations.
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When actively changing lane without switch‐
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ing on the turn signal indicator.
When the tyre pressure is too low.
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