Toyota Prius 2011 Manual page 260

2-4. Using other driving systems
Conditions that may trigger the system even if there is no danger of
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collision
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When there is an object by the roadside at the entrance to a curve
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When passing an oncoming vehicle on a curve
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When driving over a narrow iron bridge
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When there is a metal object on the road surface
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When driving on an uneven road surface
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When passing an oncoming vehicle on a left-turn
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When your vehicle rapidly closes on the vehicle in front
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When a grade separation/interchange, sign, billboard, or other structure
appears to be directly in the vehicle's line of travel
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When climbing a steep hill causes an overhead billboard, or other metal-
lic structure to appear directly in the vehicle's line of travel
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When an extreme change in vehicle height occurs
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When the axis of the radar is out of adjustment
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When passing through certain toll gates
When the system is activated in the situations described above there is also
a possibility that the seat belts will retract quickly and the brakes will be
applied with a force greater than normal. When the seat belt is locked in the
restricted position, stop the vehicle in a safe place, release the seat belt and
refasten.
When there is a malfunction in the system
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Warning lights and/or warning messages will turn on or flash. (P. 517)
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