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General information
▷ During normal brake application, the brake
lights light up.
▷ During heavy brake application, the flash‐
ers additionally light up.
Alertness assistant
Concept
The system can detect decreasing alertness or
fatigue of the driver during long, monotonous
trips, for instance on highways. In this situation,
it is recommended that the driver takes a
break.
Safety information
WARNING
The system does not relieve from per‐
sonal responsibility to assess one's physical
state. An increasing lack of alertness or fatigue
may not be detected or not be detected in
time. There is a risk of an accident. Make sure
that the driver is rested and alert. Adjust driving
style to traffic conditions.◀
Function
The system is switched on each time the engine
is started and cannot be switched off.
After travel has begun, the system monitors
certain aspects of the driver's behavior, so that
decreasing alertness or fatigue can be de‐
tected.
This procedure takes the following criteria into
account:
▷ Personal driving style, for instance steering
behavior.
▷ Driving conditions, for instance length of
trip.
Starting at approximately 43 mph/70 km/h, the
system is active and can display a recommen‐
dation to take a break.
Break recommendation
If the driver becomes less alert or fatigued, a
message is displayed in the Control Display with
the recommendation to take a break.
A recommendation to take a break is displayed
only once during an uninterrupted trip.
After a break, another recommendation to take
a break cannot be displayed until after approxi‐
mately 45 minutes.
System limits
The function may be limited in the following sit‐
uations, for instance and will either output an
incorrect warning or no warning at all:
▷ When the clock is set incorrectly.
▷ When the vehicle speed is mainly below
about 43 mph/70 km/h.
▷ With a sporty driving style, such as during
rapid acceleration or when cornering fast.
▷ In active driving situations, such as when
changing lanes frequently.
▷ When the road surface is poor.
▷ In the event of strong side winds.
The system is reset approx. 45 minutes after
parking the vehicle, for instance in the case of a
break during longer trips on highways.
Seite 153
Safety
CONTROLS
153
Online Edition for Part no. 01402983594 - X/17
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