Mercedes-Benz E-Class Sedan Operator's Manual page 171

If the system detects that there are no lane
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markings, it uses the vehicle ahead as a ref‐
erence up to a speed of 80 mph (130 km/h).
When the system is actively steering, the
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è symbol is shown in green in the multi‐
function display.
Steering Pilot system limits
Steering Pilot has a limited steering torque for
lateral guidance. In some cases, the steering
intervention is not sufficient to keep the vehicle
in the lane.
If detection of lane markings and vehicles ahead
is impaired, Steering Pilot switches to passive
mode. The system provides no support in this
case. During the transition from the active to
passive status the è symbol is shown as
enlarged and flashes yellow. Once the system is
passive the è symbol is grayed out in the
multifunction display.
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, or due to snow,
rain, fog or spray.
If there is glare, e.g. from oncoming traffic,
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direct sunlight or reflection from other vehi‐
cles (e.g. if the road surface is wet).
If the windshield is dirty, fogged up, damaged
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or covered, for instance by a sticker, in the
vicinity of the camera.
If no, or several, unclear lane markings are
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present for one lane, e.g. in a construction
area.
If 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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small and the lane markings thus 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 road is narrow and winding.
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If there are highly variable shade conditions
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on the road.
If there are obstacles such as traffic guid‐
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ance posts on the lane or projecting out into
the lane.
Driving and parking 169
The system does not provide assistance in the
following conditions:
On very sharp bends.
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When towing a trailer.
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If you actively change lane without switching
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on the turn signal indicator.
If you switch on the turn signal indicator and
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the conditions for activating Active Lane
Change Assist are not fulfilled.
Notes on Steering Pilot
Steering Pilot is only an aid. You are responsible
for the distance to the vehicle in front, for vehi‐
cle speed, for braking in good time and for stay‐
ing in your lane. Before changing lanes, make
sure that the neighboring lane is free (shoulder
view).
Active Lane Change Assist
% The availability of the following function is
country-dependent.
Steering Pilot remains active even if the turn sig‐
nal indicator is switched on. Steering Pilot then
assists the driver when changing lanes by apply‐
ing steering torque to initiate the lane change.