Toyota 2013 Prius, Owner'S Manual, Page: 270 / 586

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2-4. Using other driving systems
PRIUS v_OM_OM47820U_(U)
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Dynamic radar cruise control can be set when
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The shift position is in D.
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Vehicle speed is above approximately 30 mph (50 km/h).
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Set speed
Depending on vehicle conditions and the driving environment, it may not be
possible to maintain the set speed.
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Accelerating after setting the vehicle speed
The vehicle can accelerate normally. After acceleration, the set speed
resumes. However, during vehicle-to-vehicle distance control mode, the
vehicle speed may decrease below the set speed in order to maintain the
distance to the vehicle ahead.
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Automatic cancelation of vehicle-to-vehicle distance control
Vehicle-to-vehicle distance control driving is automatically canceled in the
following situations:
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Actual vehicle speed falls below approximately 25 mph (40 km/h).
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Enhanced VSC is activated.
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The sensor cannot operate correctly because it is covered in some way.
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The windshield wipers are operating at high speed (when the wiper
switch is set to the high speed windshield wiper operation position).
If vehicle-to-vehicle distance control driving is automatically canceled for any
other reason, there may be a malfunction in the system. Contact your Toyota
dealer.