Toyota Prius V 2012 Quick Reference Manual page 274

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Automatic cancelation of constant speed control
The cruise control will stop maintaining the vehicle speed in the following sit-
uations:
●
Actual vehicle speed is more than approximately 10 mph (16 km/h)
below the set vehicle speed.
At this time, the memorized set speed is not retained.
●
Vehicle speed falls below approximately 25 mph (40 km/h).
●
Enhanced VSC is activated.
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Radar sensor and grille cover
Always keep the sensor and grille cover clean to ensure that the vehicle-to-
vehicle distance control operates properly. (Some obstructions, such as
snow, ice and plastic objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control (vehicle-to-vehicle distance control mode) will
be canceled if dirt is detected. (Constant speed control mode can be used).
PRIUS v_U (OM47674U)
2-4. Using other driving systems
Grille cover
Radar sensor
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