#
Press the upper section of switch
1
.
or
#
Accelerate and drive faster than 28 mph
(45 km/h).
DSR deactivates automatically in the following sit-
uations:
R
You drive faster than 28 mph (45 km/h).
R
There is a malfunction in the ESP
®
or ABS sys-
tem.
Active Distance Assist DISTRONIC
Function of Active Distance Assist DISTRONIC
Active Distance Assist DISTRONIC maintains the
set speed on free-flowing roads. If vehicles ahead
are detected, the set distance is maintained, if
necessary until the vehicle comes to a halt. The
vehicle accelerates or brakes, depending on the
distance to the vehicle in front and the set speed.
Speed and distance are set and stored on the
steering wheel. The speed can be set in the range
between 12 mph (20 km/h) and 99 mph
(160 km/h) or between 12 mph (20 km/h) and
the maximum design speed.
Other features of Active Distance Assist
DISTRONIC:
R
Depending on the preselected distance,
DISTRONIC intervenes either dynamically
(short distance) or to save fuel (long distance).
R
Depending on the vehicle mass detected, the
dynamics of the DISTRONIC intervention are
reduced.
R
Rapid acceleration to the stored speed is initi-
ated if the turn signal indicator is switched on
to change to the overtaking lane.
Active Distance Assist DISTRONIC is only an aid.
The driver is responsible for the distance to the
vehicle in front, for vehicle speed and for braking
in good time.
System limits
The system may be impaired or may not function in
the following situations, forexample:
R
The radar sensors are disturbed by snow, rain,
fog, heavy spray, glare, direct sunlight or highly
variable light conditions.
R
The radar sensors may malfunction in parking
garages or on roads with steep uphill or down-
hill gradients.
R
If the radar sensors are dirty or covered.
R
On slick or slippery roads, braking or acceler-
ating can cause the wheels to lose grip and the
vehicle to skid.
R
Standing objects are not detected if they were
previously not detected as moving.
R
On bends, target vehicles may be lost or not
detected correctly. In connection with this, the
system does not regulate to a target vehicle
and unintentional acceleration may occur.
Do not use Active Distance Assist DISTRONIC in
these situations.
&
WARNING Risk of accident from accelera-
tion or braking by Active Distance Assist
DISTRONIC
Active Distance Assist DISTRONIC may accel-
erate or brake in the following cases, for exam-
ple:
R
If the vehicle pulls away using Active Dis-
tance Assist DISTRONIC.
R
If the stored speed is called up and is con-
siderably faster or slower than the cur-
rently driven speed.
R
If Active Distance Assist DISTRONIC no
longer detects a vehicle in front or does
not react to relevant objects.
#
Always carefully observe the traffic con-
ditions and be ready to brake at all times.
#
Take into account the traffic situation
before calling up the stored speed.
&
WARNING Risk of accident due to insuffi-
cient deceleration by Active Distance
Assist DISTRONIC
Active Distance Assist DISTRONIC brakes your
vehicle with up to 50% of the possible deceler-
ation. If this deceleration is not sufficient,
Active Distance Assist DISTRONIC alerts you
with a visual and acoustic warning.
#
Adjust your speed and maintain a suita-
ble distance from the vehicle in front.
#
Brake the vehicle yourself and/or take
evasive action.
152 Driving and parking
