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258 Driving mode
In such cases, Active Drive Assist might:
give an unnecessary warning
R
not give a warning
R
Always pay particular attention to the
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traffic situation and keep within the
lane, especially if Active Drive Assist
alerts you.
The system may be impaired or may not function
in the following situations:
if there is poor visibility, e.g. due to insuffi‐
R
cient road illumination or due to snow, rain,
fog or heavy spray.
if there is glare, e.g. from oncoming traffic,
R
direct sunlight or reflections (e.g. if the carria‐
geway is wet).
if the windscreen in the area of the camera is
R
dirty, misted up or damaged.
if the windscreen in the area of the camera is
R
obscured, e.g. due to a faulty windscreen
wiper or a sticker.
if no or several, unclear lane markings are
R
present for one lane, e.g. near roadworks.
if the lane markings are worn, dark or cov‐
R
ered, for example by dirt or snow.
if the distance to the vehicle in front is too
R
small and the lane markings thus cannot be
detected, e.g. due to a vehicle pulling into
your lane.
if the lane markings change quickly, e.g. lanes
R
branch off, cross one another or merge.
the road is narrow and winding.
R
if there are highly variable shade conditions
R
on the road surface.
if attachments, e.g. a snow plough, restrict
R
the camera's view of the road lane markings.
if the radar sensors are dirty or covered.
R
after a significant change in load with the
R
ignition switched on. Therefore, restart the
engine after a major change in load so that
Active Drive Assist is available without limita‐
tion.
Keep the windscreen in the area of the camera
free of dirt, snow or ice. Use the windscreen wip‐
ers or clean the windscreen by hand if required.
Please note the sections "Notes on cleaning the
vehicle exterior" (
page 315) and "Cleaning
/
sensors" (
/
page 318).
Function of Lane Keeping (LK)
Continuous lane guidance is carried out by the
Lane Keeping function.
The driver is then supported in keeping the vehi‐
cle between the lane markings through addi‐
tional, small steering interventions.
Camera and radar signals are used to control
this.
& WARNING Risk of accident due to unex‐
pected steering interventions by Active
Drive Assist
A malfunction in the detection of lane mark‐
ings and objects can occur.
This could cause unexpected steering inter‐
ventions.
Steer according to the traffic situation.
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Driving with Lane Keeping
With the activation of the distance control assis‐
tant (
page 239) the Lane Keeping function is
/
activated automatically. The system is in passive
mode. This is shown to the driver by the grey
Ø status display in the instrument cluster.
When the conditions for active steering are met,
the system changes to active mode. This is
shown to the driver by the blue Ø status dis‐
play in the instrument cluster.
The Lane Keeping function now assists the driver
in keeping the vehicle in the middle of the detec‐
ted lane with tangible steering interventions.
The driver has, at all times, the possibility of over‐
riding the LK steering interventions by actively
steering. With slight steering corrections by the
driver, the function remains active. Abrupt correc‐
tive steering, e.g. in the event of swerving
manoeuvres, is detected by the system. The sys‐
tem then switches to passive mode. This is sig‐
nalled to the driver through a warning tone and
the red Ø
Take control of steering immedi-
ately
event window in the instrument cluster.
& WARNING Risk of accident if Active
Drive Assist unexpectedly stops function‐
ing
If the system limits of Active Drive Assist are
reached, there is no guarantee that the sys‐
tem 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.
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