BMW X1 Owner's Manual page 159

▷ When lane markings are covered by objects.
▷ When driving very close to the vehicle in front
of you.
▷ When driving toward bright lights.
▷ When the windshield in front of the interior
mirror is fogged over, dirty or covered with
stickers, etc.
▷ During calibration of the camera immediately
after vehicle delivery.
Brake force display
Concept
Additional brake lights indicate emergency brak‐
ing to the traffic behind. This can reduce the risk
of a rear-end collision.
General information
▷ During normal brake application, the outer
brake lights light up.
▷ During heavy brake application, the inner
brake lights additionally light up.
Fatigue alert
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.
Online Edition for Part no. 01402631131 - X/19
Safety
Safety information
Warning
The system cannot serve as a substitute for the
driver's personal judgment in assessing 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 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 cer‐
tain aspects of the driver's behavior, so that de‐
creasing 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 recommenda‐
tion 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 and may issue an incorrect warning or no
warning at all:
CONTROLS
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