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Operation
The function is intended to prevent collisions
w
ith p
ark
ed vehicles or vehicles in the same
lane travelling in the same direction. It may
fail to activate in other danger situations.
The Front Assist function is active within a
range of speeds between 4 km/h (2.5 mph)
and 250 km/h (156 mph). Depending on
speed, traffic conditions and driver behav-
iour, some of the sub-functions described be-
low are omitted in order to optimise the sys-
tem’s general behaviour.
The Front Assist is a driving assistance func-
tion that can never replace the driver’s atten-
tion.
Safety distance warning
If the system detects a situation of danger
because the vehicle is too close to the vehi-
cle ahead, it will warn the driver by means of
an indication on the instrument panel display
.
The timing of the warning varies depending
on driver behaviour and the traffic situation.
Advance warning
If the system detects a possible collision with
the vehicle in front, it may alert the driver by
means of an audible warning and an indica-
tion on the instrument panel display
››› Fig. 189.
The warning moment varies depending on
the traffic situation and driver behaviour. At
the same time, the vehicle will prepare for a
possible emergency braking ›››
.
C
ritic
a
l warning
If the driver fails to react to the pre-warning
(advance warning), the system may actively
intervene in the brakes and generate a brief
jolt to warn the driver of the imminent danger
of a collision.
Automatic braking
If the driver also fails to react to the critical
warning, the system may initiate independ-
ent emergency braking by progressively in-
creasing the braking effect in accordance
with how critical the situation is.
Driver emergency brake assist system
Faced with an imminent collision, the system
may detect that the driver is not braking hard
enough to avoid the collision. In this case, it
will automatically increase the braking effect.
Due to certain driving circumstances and the
limitations of its operation, there are some
cases in which the system cannot prevent a
collision, although it can significantly mini-
mise the consequences by reducing the
speed and the force of the impact.
WARNING
Observe the safety warnings ›››
in Control
and warning l
amps on page 101.
WARNING
The Front Assist system cannot change the
law
s of physics or replace the driver in terms
of keeping control of the vehicle and reacting
to a possible emergency situation.
WARNING
Following a Front Assist emergency warning,
pay
immediate attention to the situation and
try to avoid the collision by braking or by
dodging the obstacle, as applicable.
●
If the Front Assist does not work as descri-
bed in this chapter (e.g. it repeatedly inter-
venes unnecessarily), switch it off.
●
Adapt your speed and safe distance to the
vehicle in front of you at all times to suit visi-
bility, weather, road and traffic conditions.
●
The Front Assist alone cannot avoid acci-
dents and serious injuries.
●
In complex driving situations, occasionally
the Front Assist may issue warnings and in-
tervene in braking unnecessarily, for example
at traffic islands.
●
If the operation of the Front Assist is im-
paired, for example, by dirt or because the ra-
dar sensor has lost its settings, the system
may issue unnecessary warnings and inter-
vene inopportunely in the braking.
180
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