Mercedes-Benz GLS Operator's Manual page 245

The driver presses a steering wheel button or
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operates Touch Control.
If Active Steering Assist detects that a system
limit has been reached, a visual warning is
issued and a warning tone sounds.
Active Steering Assist is only an aid. The driver is
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time
and for staying in lane. Before changing lanes,
the driver must make sure that the neighboring
lane is free (glance over the shoulder).
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 roadway.
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, e.g. in a construction area or inter‐
sections.
The lane markings are worn away, dark or
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covered up, e.g. by dirt or snow.
The distance to the vehicle in front is too
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small and the lane markings thus 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 bends and when turning.
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When crossing intersections.
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At traffic circles or toll stations.
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When towing a trailer.
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Driving and parking 243
When actively changing lane without switch‐
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ing on the turn signal indicator.
When the tire pressure is too low.
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Depending on the selected vehicle settings,
Active Steering Assist may be unavailable.
Observe the status display of Active Steering
Assist in the multifunction display
( page 247).
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& WARNING Risk of accident if Active
Steering Assist unexpectedly stops func‐
tioning
If the system limits of Active Steering Assist
are reached there is no guarantee that the
system will remain active or will keep the
vehicle in lane.
Always keep your hands on the steering
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wheel and observe the traffic carefully.
Always steer the vehicle paying atten‐
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tion to traffic conditions.