BMW X1 2018 Owner's Manual page 169

System limits
Safety information
WARNING
The system can react not at all, too late, incor‐
rectly, or without justification due to the system
limits. There is a risk of accidents or risk of
damage to property. Follow the information re‐
garding the system limits and actively intervene
if needed.
Functional limitations
The system may not be fully functional in the fol‐
lowing situations:
▷ In heavy fog, wet conditions, or snowfall.
▷ In the event of missing, worn, poorly visible,
merging, diverging, or multiple lane markings
such as in construction areas.
▷ When lane markings are covered in snow, ice,
dirt or water.
▷ In tight curves or on narrow lanes.
▷ When the lane markings are covered by ob‐
jects.
▷ 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.
Online Edition for Part no. 01402120596 - II/18
Safety
General information
▷ During normal brake application, the outer
brake lights light up.
▷ During heavy brake application, the inner
brake lights 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 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 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 cer‐
tain aspects of the driver's behavior, so that de‐
creasing alertness or fatigue can be detected.
CONTROLS
169