Lexus GS 350 Owner's Manual page 314

Approach warning (vehicle-to-vehicle distance control mode)
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. Depress the brake
pedal to ensure an appropriate vehicle-
to-vehicle distance.
Warnings may not occur when
■
In the following instances, warnings may not occur even when the vehicle-to-
vehicle distance is small.
When the speed of the preceding vehicle matches or exceeds your vehicle
●
speed
When the preceding vehicle is traveling at an extremely slow speed
●
Immediately after the cruise control speed was set
●
When depressing the accelerator pedal
●
GS350_300_GS F_OM_OM30J17E_(GE)
4-5. Using the driving support systems
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