Mercedes-Benz GLB 2021 Series Operator's Manual page 216

214 Driving and parking
take a break where necessary. If you do not take
a break and ATTENTION ASSIST continues to
detect increasing lapses in concentration, you
will be warned again after a minimum of
15 minutes.
You can have the following status information for
ATTENTION ASSIST displayed in the assistance
menu of the on-board computer:
The length of the journey since the last
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break.
The attention level determined by ATTENTION
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ASSIST:
the fuller the circle, the higher the atten‐
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tional level determined
as your attention wanes, the circle in the
-
center of the display becomes smaller
If ATTENTION ASSIST is unable to calculate the
attention level and cannot issue a warning, the
System Suspended message appears.
If a warning is given in the Instrument Display,
the multimedia system offers to search for a rest
area. You can select a rest area and start naviga‐
tion to this rest area. This function can be activa‐
ted and deactivated in the multimedia system.
If ATTENTION ASSIST is deactivated, the Û
symbol appears in the assistance graphic in the
Instrument Display when the engine is running.
ATTENTION ASSIST is activated automatically
when the engine is re-started. The last selected
sensitivity level remains stored.
System limits
ATTENTION ASSIST is active in the 37 mph
(60 km/h) to 124 mph (200 km/h) speed range.
The functionality of ATTENTION ASSIST is
restricted, and warnings may be delayed or not
occur at all in the following situations:
If you have been driving for less than approx‐
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imately 30 minutes.
If the road condition is poor (uneven road
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surface or potholes).
If there is a strong side wind.
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If you adopt a sporty driving style (high cor‐
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nering 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 time has been set incorrectly.
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If you change lanes and vary your speed fre‐
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quently In active driving situations.
The ATTENTION ASSIST tiredness or alertness
assessment is deleted and restarted when con‐
tinuing 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. changing drivers or taking
a break).