Lexus 2013 GS 350 Owner's Manual page 685

Warning message in radar cruise mode (if equipped)
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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
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vehicle ahead is traveling more quickly than your vehicle
When the vehicle ahead is traveling at a 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
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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
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When the steering wheel is turned as far as necessary to cause the vehicle to
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change lanes
GS350_U (OM30C34U)
7-2. Steps to take in an emergency
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