User Manual - Page 178

For 2020 CONVERTIBLE.

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Brake force display
Concept
Additional brake lights indicate emergency
braking to the traffic behind. This can re-
duce the risk of a rear-end collision.
General information
During normal brake application, the
brake lights light up.
During heavy brake application, the
flashers additionally light up.
Fatigue alert
Concept
The system can detect decreasing alertness
or fatigue of the driver during long, monoto-
nous trips, for instance on highways. In this
situation, it is recommended that the driver
takes a break.
Safety information
Warning
The system cannot serve as a substitute
for the driver’s personal judgment in as-
sessing one's physical state. An increasing
lack of alertness or fatigue may not be de-
tected or not be detected in time. There is
a risk of 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 en-
gine 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
detected.
This procedure takes the following criteria
into account:
Personal driving style, for instance
steering behavior.
Driving conditions, for instance time,
length of trip.
Starting at approximately 43 mph/70 km/h,
the system is active and can display a rec-
ommendation to take a break.
Break recommendation
If the driver becomes less alert or fatigued,
a message is displayed in the Control Dis-
play with the recommendation to take a
break.
A recommendation to take a break is dis-
played only once during an uninterrupted
trip.
After a break, another recommendation to
take a break cannot be displayed until after
approximately 45 minutes.
System limits
The function may be limited in the follow-
ing situations and may issue 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.
Seite 178
CONTROLS Safety
178
Online Edition for Part no. 01402667302 - VI/19
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