Lexus LS460 2008 Owner's Manual page 193

CAUTION
Situations unsuitable for dynamic radar cruise control
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Do not use dynamic radar cruise control in any of the following situations.
Doing so may result in inappropriate control of speed and could cause serious or
fatal accident.
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
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down gradients
Vehicle speed may exceed the set speed when driving down a steep hill.
At entrances to expressways
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When weather conditions are bad enough that they may prevent the sensors
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from functioning correctly (fog, snow, sandstorm, etc.)
When the approach warning buzzer can be heard often
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When the radar sensor may not be correctly detecting the vehicle ahead
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Apply the brakes as necessary when any of the following types of vehicles are in
front of you.
As the sensor may not be able to correctly detect these types of vehicles, the
approach warning (P. 189) will not be activated, and an accident may result.
Vehicles that cut in suddenly
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Vehicles traveling at low speeds
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Vehicles that are not moving
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Vehicles with small rear ends (trailers with no load on board etc.)
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Motorcycles traveling in the same lane
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2-4. Using other driving systems
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