obstacles, for example stopped or parked
vehicles.
If you approach an obstacle and PRE-SAFE
®
Brake detects a risk of a collision, the system
will initially alert you both visually and acous-
tically. If you do not brake or take evasive
action, the system will warn you by automat-
ically braking the vehicle gently. If there is an
increased risk of collision, preventative
passenger protection measures (PRE-SAFE
®
)
are activated (
Y
page 45). If the risk of colli-
sion remains and you do not brake, take eva-
sive action or accelerate significantly, the
vehicle may perform automatic emergency
braking. Automatic emergency braking is not
performed until immediately prior to an acci-
dent that can no longer be avoided.
G
WARNING
Even if PRE-SAFE
®
Brake slows the vehicle
before an imminent rear-end collision, the
system cannot avert a collision without the
intervention of the driver. There is a risk of an
accident. Brake according to the situation or
take evasive action. Delayed intervention by
the driver can lead to an accident.
G
WARNING
PRE-SAFE
®
Brake cannot always clearly iden-
tify objects and complex traffic conditions.
In these cases, PRE-SAFE
®
Brake may:
R
give an unnecessary warning and then
brake the vehicle
R
not give a warning or intervene
There is a risk of an accident. Always pay par-
ticular attention to the traffic situation and be
ready to brake, especially if PRE-SAFE
®
Brake
warns you. Terminate the intervention in a
non-critical driving situation.
In particular, the detection of obstacles can
be impaired if there is:
R
dirt on the sensors or anything else cover-
ing the sensors
R
snow or heavy rain
R
interference by other radar sources
R
the possibility of strong radar reflections,
for example in multi-storey car parks
R
a narrow vehicle travelling in front, e.g. a
motorbike
R
a vehicle travelling in front on a different
line
G
WARNING
PRE-SAFE
®
Brake does not react:
R
to people or animals
R
to oncoming vehicles
R
to crossing traffic
R
when cornering
As a result, PRE-SAFE
®
Brake may not give
warnings or intervene in critical situations.
There is a risk of an accident. Always pay
careful attention to the traffic situation and be
ready to brake.
In order to maintain the appropriate distance
to the vehicle in front and thus prevent a col-
lision, you must apply the brakes yourself.
X
To activate/deactivate: activate or deac-
tivate PRE-SAFE
®
Brake in the on-board
computer (
Y
page 245).
The
Ä
symbol appears in the multifunc-
tion display as long as the HOLD function
is not activated (
Y
page 187).
On vehicles with Active Parking Assist, the
Ä
symbol is displayed when P is
engaged or you are driving faster than
35 km/h.
The radar sensor system is switched off auto-
matically in the vicinity of radio telescope
facilities in the following vehicles:
R
vehicles with COMAND Online and naviga-
tion
R
vehicles with Audio 20 and Becker
®
MAP
PILOT
Becker
®
MAP PILOT must be connected;
see the separate Audio 20 operating
instructions.
Driving safety systems
67
Safety
Z
