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has been made. If a measu rement is not pos -
sib le, the system cannot respond and will not
react to a vehicle or someth ing else up ahead .
Open road
When the road is clear , the adaptive cru ise
control wo rks like cruise control. It maintains
a constant target speed specified by the driv-
er.
Driving in traff ic
If a slower vehicle d riving ahead is detected,
the adaptive cru ise contro l decelerates (wit hin
the limits of the system) ¢ page 124, Driver
intervention prompt and ¢ page 125, System
limitations to its speed and after adjusting,
tr ies to maintain the set distance from the ve-
hicle ahead. The vehicle may temporarily drive
slower t han t he set speed while adjusting
¢
.&.
in Description on page 113 .
If the vehicle in front acce lerates, adaptive
cru ise control also accelerates up to the speed
t ha t you have set.
If the vehicle ahead slows to a stop , ACC will
slow your vehicle down and to a complete
st op if this is possible w ith in the system's lim-
its and capabilities. ACC will not make an
emergency stop . The text message ACC off:
manual control! appears in the instrument
cluster display. Once the veh icle stops, you
must dep ress the brake pedal to prevent t he
veh icle from mov ing forward or "creeping" .
Depressing the brake pedal turns off ACC.
When the vehicle ahead accelerates you can
reactivate ACC
¢
page 118, as soon as your
vehicle has reached a speed of 1 mph (2 km/
h) .
Situat ions requiring driver int ervention
In some situations you will have to use the
footbrake to slow the vehicle down in order to
keep a safe distance from vehicle in front of
you or to avo id a rear -end coll is ion. In this sit-
uation, a symbol appears and a warning tone
sounds ¢ page 124 .
Ada p ti v e crui se control
115
Passing another vehicle
If you move int o t he passing lane and no vehi-
cle is detected ahead , the adapt ive cr uise con-
trol acce le rates to the speed you have set and
maintains it.
Overriding ACC
You can increase your speed at a ny time by
stepping on the accelera t or ped a l. Aft er you
release the accelerator peda l, the system ad-
justs back down to the speed you prev ious ly
set .
Reducing stopp ing distance
If t he radar sensor detects that the d istance
to the vehicle a head is less than de fined m ini-
mum distance, the brakes are automatically
prepared fo r emergency braking by the d river.
The brake pads are moved very close to the
brake d iscs without actually braking the vehi-
cle. This brake assistant feature reacts more
quick ly to the dr iver's brak ing, and also works
when adapt ive cruise control is off . The stop-
ping distance is reduced as a result of th is ad-
vance brake preparation . This fun ction does
not perform any emergency brak ing mane u-
vers by itse lf; the dr iver mus t always apply the
brakes.
A
WARNING
If ACC initiates a braking maneuver, the
brake pedal w ill be retracted. Inter ference
with the brake peda l can prevent ACC from
slowing the veh icle down and cause a
crash and serious personal injury.
- Never put anything in the driver's foot-
well or let anyth ing fall into it. An object
in the driver's footwe ll can inte rfe re with
the peda ls and prevent the acce le rator
from being used to override ACC or pre-
vent ACC from being switched off when
the brake pedal is depressed and also
prevent the vehicle from being slowed
down or stopped .
- Only use floor mats that keep t he area
aroun d the peda ls free and that can be
securely fastened to the footwell .
-
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