Volvo XC90 TWIN ENGINE 2018 Owner's Manual page 320

DRIVER SUPPORT
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Limited field of vision
The radar sensor has a limited field of vision. In
some situations, it may detect a vehicle later than
expected or not at all.
The radar sensor's field of vision.
The radar sensor's detection of vehicles very
close to your vehicle may be delayed in cer-
tain situations, e.g. if a vehicle pulls in
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between your vehicle and the vehicle directly
ahead.
Small vehicles, such as motorcycles, or vehi-
cles that are not driving in the center of the
lane may remain undetected.
In curves, the radar may detect the wrong
vehicle or lose sight of a target vehicle.
Low trailers
Low trailer in the radar shadow.
Low trailers may also be difficult or even impossi-
ble for the radar to detect. The driver should be
extra alert when driving behind vehicles towing
low trailers when Adaptive Cruise Control or Pilot
Assist is activated.
Camera
Reduced visibility
Cameras have the same limitations as the human
eye. In other words, their "vision" is impaired by
adverse weather conditions such as heavy snow-
fall/rain, dense fog, swirling dust/snow, etc.
These conditions may reduce the function of sys-
tems that depend on the camera or cause these
systems to temporarily stop functioning.
Strong sunlight, reflections from the road surface,
ice or snow covering the road, a dirty road sur-
face, or unclear lane marker lines may drastically
reduce the camera's ability to detect the side of a
lane, a pedestrian, a cyclist, a large animal or
another vehicle.