Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 231

System limits
ATTENTION ASSIST is active in the 60 km/h to
200 km/h speed range.
The microsleep detection function is available at a
speed of 20 km/h and above.
Particularly in the following situations, ATTENTION
ASSIST only functions in a restricted manner and
warnings may be delayed or not occur:
If you have been driving for less than approx-
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imately 30 minutes.
If the road condition is poor (uneven road sur-
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face or potholes).
If there is a strong side wind.
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If you adopt a sporty driving style (high corner-
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ing speeds or high rates of acceleration).
If the Steering Assist function of Active Dis-
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tance Assist DISTRONIC is active.
If the clock is set to the incorrect time.
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If you change lanes and vary your speed fre-
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quently In active driving situations.
Microsleep detection also does not function when
the driver camera cannot detect the driver's eyes,
for example as a result of the following factors:
The driver's eyes are covered due to the steer-
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ing column position, for example.
Poor lighting conditions.
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Some types of spectacles or sunglasses.
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The driver's line of vision is outside the driver
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camera's field of vision.
Also observe any information regarding display
messages that can be displayed in the driver dis-
play.
The tiredness and alertness assessment of
ATTENTION ASSIST with microsleep detection is
reset and restarted when continuing the journey
in the following situations:
If you switch off the engine.
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If you unfasten your seat belt and open the
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driver's door (e.g. to change drivers or take a
break).
P223 0288 02
Driving and parking 229
Limiter
▌Function of the limiter
The limiter restricts the speed of the vehicle. To
reduce the speed to the set speed, the limiter
applies the brakes automatically.
You can limit the speed as follows:
Variable: for a short-term speed restriction,
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e.g. in built-up areas
Permanent: for a longer-term speed restric-
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tion, e.g. in winter tyre mode
The variable limiter is operated using the corre-
sponding steering wheel buttons (
You can store any speed above 20 km/h up to the
maximum design speed or up to the set winter
tyre limit. You can also perform settings while the
vehicle is stationary if the vehicle has been star-
ted.
Observe the notes on driving systems and your
responsibility; you may otherwise fail to recognise
dangers ( page 220).
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page 233).
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