Lexus LS 460 2017, Manual, Page: 325 / 708

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4-5. Using the driving support systems
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LS460/LS460L_GE (OM50G06E)
CAUTION
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To avoid inadvertent cruise control activation
Switch the cruise control off using the “ON•OFF” button when not in use.
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Situations unsuitable for dynamic radar cruise control
Do not use dynamic radar cruise control in any of the following situations.
Doing so may result in inappropriate speed control and could cause an accident
resulting in death or serious injury.
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In heavy traffic
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On roads with sharp bends
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On winding roads
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On slippery roads, such as those covered with rain, ice or snow
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On steep downhills, or where there are sudden changes between sharp up and
down gradients
Vehicle speed may exceed the set speed when driving down a steep hill.
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At entrances to expressways
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When weather conditions are bad enough that they may prevent the sensors
from functioning correctly (fog, snow, sandstorm, heavy rain, etc.)
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When an approach warning buzzer is heard often