Mercedes-Benz E-Class Coupe 2021 Operator's Manual page 188

186 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 steer‐
ing wheel, display 1 appears. If the driver still
does not steer the vehicle, a warning tone
sounds in addition to the visual warning mes‐
sage.
If the driver does not react to the warning for a
considerable period, the system can initiate an
emergency stop ( page 187).
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If the driver steers, no warning is issued, or the
warning is ended.
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‐
nize dangers ( page 167).
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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 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,
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fog, heavy spray, greatly varying ambient
light or strong shadows on the road.
There is glare, e.g. from oncoming traffic,
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direct sunlight or reflections.
Insufficient road illumination.
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The windshield is dirty, fogged 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 at intersections.
The lane markings are worn away, dark or
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covered 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, such as object markers.
The system does not provide assistance in the
following conditions:
On tight curves and when turning.
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When crossing intersections.
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At roundabouts or toll plazas.
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When the tire pressure is too low.
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