Toyota 2010 Prius Owner's Manual page 265

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Temporary cancellation of the LKA system functions
If any of the following occurs, the LKA system functions will be temporarily
canceled. The functions will resume after the necessary operating conditions
have returned.
●
The turn signal lever is operated.
●
The steering wheel is turned as far as necessary to cause the vehicle to
change lanes.
●
The brake pedal is depressed.
The lane keeping assist function will not resume even after the brake
pedal is released because depressing the brake pedal also cancels the
dynamic radar cruise control.
●
The vehicle speed deviates from the operating range of the LKA system
functions. (The buzzer will beep twice when the lane keeping assist func-
tion is being canceled.)
●
When the lane lines cannot be recognized while driving. (The buzzer will
beep twice when the lane keeping assist function is being canceled.)
●
Low speed or high speed wiper operation states. (The buzzer will beep
twice when the lane keeping assist function is being canceled.)
The buzzer may not beep when the LKA system functions are canceled
because the notification of dynamic radar cruise control cancellation
takes priority over the LKA system and cancels the function.
●
The no-handed driving warning activates while the lane keeping assist
function is active. (The buzzer will beep twice.)
2-4. Using other driving systems
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