Lexus LS460 2011 Owner's Manual page 253

Example of follow-up cruising
When following a vehicle driving slower than the set speed
The system continues follow-up cruising while adjusting for changes
in the speed of the vehicle ahead in order to maintain the vehicle-to-
vehicle distance set by the driver.
Example of acceleration
When there are no longer any vehicles ahead driving slower than
the set speed
The system accelerates until the set speed is reached. The system then
returns to constant speed cruising.
Approach warning
When your vehicle is too close to a vehicle ahead, and sufficient
automatic deceleration via the cruise control is not possible, the
display will flash and the buzzer will sound to alert the driver. An
example of this would be if another driver cuts in front of you
while you are following a vehicle. Apply the brakes to ensure an
appropriate vehicle-to-vehicle distance.

Warnings may not occur when
In the following instances, there is a possibility that the warn-
ings will not occur:
 When the speed of the vehicle ahead matches or exceeds your
vehicle speed
 When the vehicle ahead is traveling at an extremely slow
speed
 Immediately after the cruise control speed was set
 At the instant the accelerator is applied
LS460_EE
2-4. Using other driving systems
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