Toyota prius Owner's Manual page 302

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2-4. Using other driving systems

Driving in vehicle-to-vehicle distance control mode

This mode employs a radar sensor to detect the presence of vehicles

up to approximately 120 m (400 ft.) ahead, determines the current

vehicle-to-vehicle following distance, and operates to maintain a suit-

able following distance from the vehicle ahead.

Note that vehicle-to-vehicle distance will close in when traveling on long

downhill slopes.

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