Mercedes-Benz 2013 CLA Owner's Manual page 200

Driving systems
198
Important safety notes
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WARNING
Blind Spot Assist does not react to vehicles:
overtaken too closely on the side, placing
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them in the blind spot area
when the difference in the speed of
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approach and overtaking is too great
As a result, Blind Spot Assist cannot warn
drivers in these situations. There is a risk of
an accident.
Always pay careful attention to the traffic sit-
uation and maintain a safe distance at the side
of the vehicle.
Blind Spot Assist is only an aid. It may fail to
detect some vehicles and is no substitute for
attentive driving.
Monitoring range of the sensors
In particular, the detection of obstacles can
be impaired in the case of:
dirt on the sensors or the sensors are
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obscured
poor visibility, e.g. due to fog, heavy rain or
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snow
a narrow vehicle travelling in front, e.g. a
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motorcycle or a bicycle
very wide lanes
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narrow lanes
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vehicles not driving in the middle of their
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lane
barriers or other road boundaries
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Vehicles in the monitoring range are then not
indicated.
Blind Spot Assist monitors the area up to
3.0 m behind your vehicle and directly next to
your vehicle, as shown in the diagram. For this
purpose, Blind Spot Assist uses radar sensors
in the rear bumper.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may
be the case if the vehicles are driving on the
inner side of their lane.
Due to the nature of the system:
warnings may be issued in error when driv-
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ing close to crash barriers or similar solid
lane borders.
warnings may be interrupted when driving
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alongside particularly long vehicles, for
example lorries, for a prolonged time.
The two sensors for Blind Spot Assist are
integrated into the sides of the rear bumper.
Make sure that the bumper is free of dirt, ice
or slush in the vicinity of the sensors. The
radar sensors must not be covered, for exam-
ple by cycle racks or overhanging loads. Fol-
lowing a severe impact or in the event of dam-
age to the bumpers, have the function of the
radar sensors checked at a qualified special-
ist workshop. Blind Spot Assist may other-
wise not work properly.