Lexus RX 450h 2010 Owner's Manual page 235

2-4. Using other driving systems
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 speed control and could cause an accident
resulting in death or serious injury.
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 and snow
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On steep downhills, or where there are sudden changes between sharp up and
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down gradients
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, heavy rain, etc.)
When a buzzer is heard often
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When your vehicle is towing anything
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When the 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. 229) 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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