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System limits
The system may be impaired or may not function
in the following instances, for example:
The radar sensors are affected by snow, rain,
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fog or heavy spray.
If the radar sensors are dirty or covered.
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The sensors are affected by interference from
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other radar sources, e.g. strong radar reflec‐
tions in multi-storey car parks.
On icy or slippery roads, braking or accelerat‐
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ing can cause the drive wheels to lose trac‐
tion and the vehicle could then skid.
In traffic conditions that are unsuitable for
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driving at a constant speed, e.g. in heavy traf‐
fic, on winding roads or off-road.
On roads with steep downhill or uphill gradi‐
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ents with a fully laden vehicle.
Stationary objects are not detected if these
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were not previously detected as moving.
On bends, target vehicles may be lost or not
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recognised correctly. As a result, a target
vehicle is not used to regulate the speed
which may lead to unwanted acceleration.
Do not use Active Distance Assist DISTRONIC in
these situations.
& WARNING Risk of accident from acceler‐
ation or braking by Active Distance Assist
DISTRONIC
Active Distance Assist DISTRONIC may accel‐
erate or brake in the following cases, for
example:
If the vehicle pulls away using Active Dis‐
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tance Assist DISTRONIC.
If the stored speed is called up and is con‐
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siderably faster or slower than the cur‐
rently driven speed.
If Active Distance Assist DISTRONIC no
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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
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before calling up the stored speed.
& WARNING Risk of accident due to insuf‐
ficient deceleration by Active Distance
Assist DISTRONIC
Active Distance Assist DISTRONIC brakes
your vehicle with up to 50% of the possible
deceleration. If this deceleration is not suffi‐
cient, Active Distance Assist DISTRONIC
alerts you with a visual and acoustic warning.
Adjust your speed and maintain a suita‐
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ble distance from the vehicle in front.
Brake the vehicle yourself and/or take
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evasive action.
& WARNING Risk of accident if detection
function of Active Distance Assist
DISTRONIC is impaired
Active Distance Assist DISTRONIC does not
react or has a limited reaction:
when driving on a different lane or when
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changing lanes
to pedestrians, animals, bicycles or sta‐
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tionary vehicles, or unexpected obstacles
to complex traffic conditions
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to oncoming vehicles and crossing traffic
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As a result, Active Distance Assist DISTRONIC
may neither give warnings nor intervene in
such situations.
Always observe the traffic conditions
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carefully and react accordingly.
Active Distance Assist DISTRONIC may not detect
narrow vehicles driving in front, e.g. motorcycles
or vehicles not travelling in line with your vehicle.
Operating Active Distance Assist DISTRONIC
Requirements
The vehicle has been started. It may take up
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to two minutes of driving before Active Dis‐
tance Assist DISTRONIC is ready for use.
The parking brake has been released.
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®
ESP
is activated and is not intervening.
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Active Parking Assist is not activated.
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The transmission is in position h.
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The doors and tailgate are closed.
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The driver's seat belt is fastened.
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Driving and parking 153
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