Toyota 2014 Prius Owner's Manual page 525

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Warning message in radar cruise mode (if equipped)
In the following cases, the warning message may not be displayed even if
vehicle-to-vehicle distance decreases:
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When your vehicle and the vehicle ahead are traveling at the same
speed or the vehicle ahead is traveling more quickly than your vehicle.
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When the vehicle ahead is traveling at very low speed.
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Immediately after cruise control speed is set.
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At the instant the accelerator pedal is depressed.
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The LKA (Lane-Keeping Assist) lane departure warning function (if
equipped)
In the following cases, the warning message will not be displayed even if a
lane line is crossed.
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When the vehicle speed deviates from the operating range of the LKA
system functions
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When the lane lines cannot be recognized
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When the steering wheel is turned as far as necessary to cause the vehi-
cle to change lanes
5-2. Steps to take in an emergency
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