Toyota Prius 2011 Manual page 259

Obstacles not detected
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The sensor cannot detect plastic obstacles such as pylons. There may also
be occasions when the radar sensor cannot detect pedestrians, animals,
bicycles, motorcycles, trees, or snowdrifts.
The pre-collision system is operational when
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Pre-collision seat belts (linked to the radar sensor):
• Vehicle speed is above 4 mph (5 km/h).
• The speed at which your vehicle is approaching the obstacle or oncom-
ing vehicle exceeds 19 mph (30 km/h).
• The front occupants are wearing a seat belt.
●
Pre-collision seat belts (linked to brake operation):
• Vehicle speed exceeds 19 mph (30 km/h).
• The system detects sudden braking or skidding.
• The front occupants are wearing a seat belt.
●
Pre-collision brake assist:
• Vehicle speed is above 19 mph (30 km/h).
• The relative speed difference between your vehicle and another vehi-
cle that is ahead of your vehicle, or the speed at which your vehicle is
approaching an obstacle is greater than 19 mph (30 km/h).
• The brake pedal is depressed.
●
Pre-collision braking:
• The pre-collision braking off button is not pressed.
• Vehicle speed is above 10 mph (15 km/h).
• The relative speed difference between your vehicle and another vehi-
cle that is ahead of your vehicle, or the speed at which your vehicle is
approaching an obstacle is greater than 10 mph (15 km/h).
2-4. Using other driving systems
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