Toyota 2015 Prius Owner's Manual page 528

5-2. Steps to take in an emergency
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:
●
When your vehicle and the vehicle ahead are traveling at the same
speed or the vehicle ahead is traveling more quickly than your vehicle.
●
When the vehicle ahead is traveling at very low speed.
●
Immediately after cruise control speed is set.
●
At the instant the accelerator pedal is depressed.
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.
●
When the vehicle speed deviates from the operating range of the LKA
system functions
●
When the lane lines cannot be recognized
●
When the steering wheel is turned as far as necessary to cause the vehi-
cle to change lanes
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