BMW Z4 Roadster Owner's Handbook Manual page 184

CONTROLS
Dynamic brake lights
Principle
The brake lights flash to warn road users behind
your vehicle that you are performing an emer‐
gency braking manoeuvre. This can reduce the
risk of a rear-end collision.
General
▷ Normal braking: brake lights illuminate.
▷ Heavy braking: brake lights flash.
Shortly before the vehicle comes to a standstill,
the hazard warning lights are activated.
To switch off the hazard warning lights:
▷ Accelerate.
▷ Press the hazard warning lights button.
PostCrash – iBrake
Principle
The system can automatically bring the vehicle
to a standstill in certain accident situations with‐
out the involvement of the driver. The risk of a
further collision and its consequences can
thereby be reduced.
At a standstill
After the vehicle has come to a halt, the brake is
released automatically.
184
Safety
Harder vehicle braking
In certain situations, it may be necessary to bring
the vehicle to a standstill more quickly.
To do this, for a short time the braking pressure
applied when stepping on the brake pedal must
be higher than the braking pressure achieved by
the automatic braking function. This action inter‐
rupts the automatic braking process.
Cancelling automatic braking
In certain situations, it may be necessary to can‐
cel automatic braking, for example for an evasive
manoeuvre.
Cancel automatic braking:
▷
▷
Attentiveness assistant
General
The system can detect decreasing attentiveness
or the onset of fatigue in the driver on long mo‐
notonous journeys, for example on motorways. In
this situation, it is recommended that you take a
break.
Safety note
The system does not relieve you of your per‐
sonal responsibility to assess your physical
condition correctly. Increasing inattention or fa‐
tigue might not be detected, or may not be de‐
tected in good time. There is a danger of acci‐
dents. Make sure that the driver is rested and
alert. Adapt your driving style to the traffic con‐
ditions.
Online Edition for Part no. xxx - X/18
By depressing the brake pedal.
By depressing the accelerator pedal.
WARNING