Operation
time. The driver is always responsible for
keepin
g the vehicle in its own lane.
●
Always be prepared to take charge of driv-
ing (accelerating or braking) yourself.
Note
●
If
Traffic Jam Assist does not work as de-
scribed in this chapter, stop using it and con-
tact a specialised workshop.
●
If the system is faulty, take it to a special-
ised workshop and have it checked.
Emergency Assist
D
e
scription and operation
Emergency Assist detects whether there is in-
activ
ity
by the driver and can automatically
keep the car within the lane 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 213 and combines Lane
Assist functions with Adaptive Cruise Control
(ACC) ››› page 197. 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 repeatedly
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 ›››
. If the re-
m
ainin
g braking distance is sufficient, if nec-
essary the system slows down the vehicle un-
til it stops completely and automatically
switches on the electronic parking brake
››› page 170.
When the Emergency Assist is actively adjust-
ing, the hazard warning lights come on
››› page 135 and the vehicle makes slight zig-
zag movements in the lane in order to warn
other drivers.
Switching the Emergency Assist on and off
The Emergency Assist is switched on auto-
matically when the Lane Assist is switched on
››› page 213.
Technical requirements for using the Emer-
gency Assist
●
The adaptive cruise control (ACC) must be
switched on ››› page 197.
●
The Lane Assist must be switched on
››› page 213.
●
The selector lever must be at the D/S posi-
tion or in the Tiptronic selection track.
●
The system must have detected a lane sep-
aration line on both sides of the vehicle
››› Fig. 190.
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 218, Technical requirements for us-
ing the Emergency Assist are not fulfilled.
●
If any of the conditions required for opera-
tion of the Lane Assist are not met
››› page 213.
●
If any of the conditions necessary for the
adaptive cruise control (ACC) to work are no
longer fulfilled ››› page 197.
WARNING
The smart technology incorporated into the
Emerg
ency Assist cannot overcome the limits
imposed by the laws of physics; it only 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
218
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