Lexus ES350 Manual page 782

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 LDA (Lane Departure Alert) system (if equipped)
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In the following cases, the warning message will not be displayed even if the vehicle
deviates from the lane markers.
When the vehicle speed deviates from the operating range of the LDA system
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functions
When the lane markers cannot be recognized
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ES350_300h_OM_OM33A60U_(U)
7-2. Steps to take in an emergency
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