BMW X5 2018 Owner's Manual page 148

Controls
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 driv‐
ing 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 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
situations, for instance and will either output an
incorrect warning or no warning at all:
▷ When the clock is set incorrectly.
148
Safety
Online Edition for Part no. 01402983801 - X/17
▷ 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.
PreCrash
Concept
With this system critical driving situations that
might result in an accident can be detected
above a speed of approx. 20 mph/30 km/h. In
these situations, preventive measures are au‐
tomatically taken to minimize the risk of an ac‐
cident as much as possible.
Critical driving situations may include:
▷ Emergency stop.
▷ Severe understeering.
▷ Severe oversteering.
If the vehicle includes the approach control
warning or approach control warning with light
braking function, impending collisions with ve‐
hicles driving ahead or stopped in front of you
can also be detected within the system's
range.
Safety information
WARNING
The system does not relieve from per‐
sonal responsibility. Due to the system limits,
critical situation could not be detected reliably
or in time. There is a risk of an accident. Adjust
driving style to traffic conditions. Watch traffic
closely and actively intervene where appropri‐
ate.◀