Lexus LS460 2011 Owner's Manual page 268

2-4. Using other driving systems
Example of deceleration cruising and follow-up cruising
When the vehicle ahead is driving slower than the set speed
When a vehicle is detected running ahead of you, the system automat-
ically decelerates your vehicle. When a greater reduction in vehicle
speed is necessary, the system applies the brakes. The system will
respond to changes in the speed of the vehicle ahead in order to main-
tain the vehicle-to-vehicle distance set by the driver. A warning tone
warns you when the system cannot decelerate sufficiently to prevent
your vehicle from closing in on the vehicle ahead. When the vehicle
ahead of you stops, your vehicle will also stop. After the vehicle ahead
starts off, pushing the cruise control lever up or depressing the acceler-
ator pedal will resume follow-up cruising.
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
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