BMW Z4 Roadster Owner's Handbook Manual page 183

Prevention of rear collision
Principle
The system responds to vehicles approaching
from behind.
General
Two radar sensors in the rear bumper monitor
the area behind the vehicle.
If a vehicle is approaching from behind at appro‐
priate speed, the system responds as follows:
▷ The hazard warning lights are switched on to
warn the traffic behind if there is potential for
a rear collision.
Safety notes
WARNING
The system does not relieve you of your per‐
sonal responsibility to assess the visibility con‐
ditions and traffic situation correctly. There is a
danger of accidents. Adapt your driving style to
the traffic conditions. Observe the traffic situa‐
tion and intervene actively if the situation war‐
rants it.
WARNING
Displays and warnings do not relieve you of
your personal responsibility. System limitations
can mean that warnings or system responses
are not issued or are issued too late, incorrectly
or without justification. There is a danger of ac‐
Online Edition for Part no. xxx - X/18
Safety
cidents. Adapt your driving style to the traffic
conditions. Observe the traffic situation and in‐
tervene actively if the situation warrants it.
Overview
Radar sensors
The radar sensors are located in the rear
bumper.
Keep the bumpers clean and unobstructed in the
area of the radar sensors.
Switching on/off
The system is automatically activated at the start
of each journey.
The system is deactivated in the following situa‐
tions:
▷ When reversing.
System limits
The system may have limited functionality in the
following situations:
▷ If the speed of the approaching vehicle is sig‐
nificantly higher than the driver's own speed.
▷ If the approaching vehicle is travelling slowly.
▷ In thick fog, wet conditions or snow.
▷ On sharp bends or narrow roads.
▷ If the bumper is dirty, iced up or covered,
for example by stickers.
▷ When a projecting load is being transported.
CONTROLS
183