Toyota Prius+ Owner's Manual page 309

 The pre-crash safety system is operational when
Pre-crash seat belts (operating conditions A):

• Vehicle speed is greater than about 30 km/h (19 mph).
• The system detects sudden braking or skidding.
• The front occupants are wearing a seat belt.
 Pre-crash seat belts (operating conditions B):
• Vehicle speed is greater than about 5 km/h (4 mph).
• The speed at which your vehicle is approaching the obstacle or the
vehicle running ahead of you is greater than about 30 km/h (19 mph).
• The front occupants are wearing a seat belt.
 Pre-crash brake assist:
• Vehicle speed is greater than about 30 km/h (19 mph).
• The speed at which your vehicle is approaching the obstacle or the
vehicle running ahead of you is greater than about 30 km/h (19 mph).
• The brake pedal is depressed.
 Pre-crash braking:
• Vehicle speed is greater than about 15 km/h (10 mph).
• The speed at which your vehicle is approaching the obstacle or the
vehicle running ahead of you is greater than about 15 km/h (10 mph).
• The pre-crash braking off switch is not pressed.
PRIUS +_OM_OM47821E_(EE)
2-4. Using other driving systems
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