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Driver assistance systems
●
Keep your hands on the wheel at all times
to be ready to int
ervene in the steering at
any time. The driver is always responsible
for keeping the vehicle in its own lane.
●
Always be prepared to take charge of
driving (accelerating or braking) yourself.
Note
●
If T
raffic Jam Assist does not work as de-
scribed in this chapter
, stop using it and
contact a specialised workshop.
●
If the system is faulty, take it to a special-
ised workshop and have it checked.
Emergency Assist
Description and oper
ation
Emergency Assist detects whether there is in-
activit
y by the driv
er and can aut
omatically
k
eep the car within the l
ane and stop it alto-
gether if necessary. This way the system can
actively help avoid an accident.
Emergency Assist is an additional function of
Lane Assist
›››
page 284 and combines Lane
Assist functions with Adaptive Cruise Control
(ACC)
›››
page 276. Therefore, it is essential
that you read these two chapters carefully
and note the limitations of the systems and
the information about them.
Operation of Emergency Assist
Emergency Assist detects when the driver
ceases to perform any activity and repeated-
ly requests that he/she regain active control
of the vehicle, through the use of optical and
acoustic warnings and by applying the
brakes.
If the driver continues to do nothing, the sys-
tem automatically takes over the accelerator,
brakes and steering in order to brake the ve-
hicle and keep it in its lane
›››
. When the
emer
gency assist
ant is activ
ely r
egul
ating,
the hazard lights turn on
›››
page 123.
If the remaining braking distance is sufficient,
if necessary the system slows down the vehi-
cle until it stops completely and automati-
cally switches on the electronic parking
brake
›››
page 297.
Connecting and disconnecting Emergen-
cy Assist
The Emergency Assist is switched on auto-
matically when the Lane Assist is switched on
›››
page 284.
Technical requirements for using the Emer-
gency Assist
●
The adaptive cruise control (ACC) must be
switched on
›››
page 276.
●
The Lane Assist must be switched on
›››
page 284.
●
The selector lever must be in the D/S posi-
tion or in the Tiptronic selector gate.
●
The system must have detected a lane
separation line on both sides of the vehicle
›››
Fig. 271.
The following conditions may cause the
Emergency Assist not to react or to switch
off automatically:
●
If the driver accelerates, brakes or moves
the steering wheel.
●
If any of the conditions mentioned in
›››
page 289, Technical requirements for
using the Emergency Assist are not fulfilled.
●
If any of the conditions required for opera-
tion of the Lane Assist are not met
›››
page 284.
●
If any of the conditions necessary for the
adaptive cruise control (ACC) to work are no
longer fulfilled
›››
page 276.
WARNING
The smart technology incorporated into
the Emergency Assist cannot overcome the
limits imposed by the l
aws of physics; it on-
ly works within the limits of the system. The
driver is responsible for driving the vehicle.
●
Adapt your speed and safe distance to
the vehicle in front of you at all times to suit
the visibility, weather, road and traffic con-
ditions.
»
289
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