Volvo XC90 Owner's Manual page 295

NOTE
Keep the windscreen clean in front of the
camera and radar unit.
The capacity of the radar unit to detect vehicles
ahead is reduced significantly if:
•
the speed of vehicles in front is significantly
different from your own speed
Limited field of vision
The radar unit has a limited field of vision. In
some situations another vehicle is not detected,
or the detection is made later than expected.
The radar unit's field of vision.
Sometimes the radar unit is late at detecting
vehicles at close distances - e.g. a vehicle
that drives in between the car and vehicles in
front.
Small vehicles, such as motorcycles, or vehi-
cles not driving in the centre of the lane can
remain undetected.
In bends the radar unit may detect the wrong
vehicle or lose a detected vehicle from view.
DRIVER SUPPORT
Low trailer in radar shadow.
Low trailers can be difficult to detect or may be
completely missed - the driver should then be
particularly careful when stopping behind them.
High temperature
At very high temperatures the camera and radar
unit can temporarily be switched off for
about 15 minuter after the engine is started so
as to protect the unit's electronics. The camera
and radar unit restarts automatically when the
temperature has fallen sufficiently.
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