Mercedes-Benz S-Class 2019 Operator's Manual page 213

If no vehicle is detected in the adjacent lane and
a lane change is permitted, the steering wheel
symbol and the arrow are shown in green
The Lane Change to the Left message appears,
for example. If Active Lane Change Assist has
been activated with the turn signal indicator but
a lane change is not immediately possible, the
steering wheel symbol remains green and the
arrow appears gray 1. When the lane change
support starts, the turn signal indicator is auto‐
matically activated.
If a lane change is not possible, the arrow fades
out after a few seconds and a new lane change
must be initiated. An immediate lane change is
only possible on freeway sections without speed
limits.
If the system is impaired, Active Lane Change
Assist may be canceled. If it is canceled, the
Lane Change Canceled
multifunction display and a warning tone sounds.
& WARNING Risk of accident from chang‐
ing lane to an occupied adjacent lane
Lane Change Assist cannot always detect
clearly if the adjacent lane is free.
The lane change might be initiated although
2 .
the adjacent lane is not free.
Before changing lanes, make sure that
#
the neighboring lane is free and there is
no danger to other road users.
Monitor the lane change.
#
& WARNING Risk of accident if Lane
message appears in the
System limitations
The system limitations of Active Steering Assist
apply to Active Lane Change Assist
(
→
The system may also be impaired or may not
function in the following situations:
R
R
Driving and parking 211
Change Assist unexpectedly stops func‐
tioning
If the system limitations for Lane Change
Assist have been reached, there is no guar‐
antee that the system will remain active.
Lane Change Assist cannot then assist you
by applying steering torques.
Always monitor the lane change and
#
keep your hands on the steering wheel.
Observe the traffic conditions and steer
and/or brake if necessary.
page 208).
The sensors in the rear bumper are dirty,
damaged or covered, for instance by a
sticker or ice and snow.
The exterior lighting is malfunctioning.