Lexus LS460 2008 Owner's Manual page 191

Radar sensor and grille
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Always keep the sensor and grille clean to ensure that the vehicle-to-vehicle dis-
tance control operates properly. (Some obstructions, such as snow, ice or plastic
objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
Approach warning
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In the following instances, there is a possibility that the warnings will not occur:
When the speed of the vehicle ahead matches or exceeds your vehicle' s speed
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When the vehicle ahead is traveling at an extremely slow speed
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Immediately after the cruise control speed has been set
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At the instant the accelerator is applied
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2-4. Using other driving systems
Radar sensor
2
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